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class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Locomotive wheel arrangement</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For usage in video production, see <a href="/wiki/Chroma_subsampling" title="Chroma subsampling">Chroma subsampling</a>.</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:MR_4-2-2_673,_Rocket_150,_Rainhill,_May_1980_Slides184_(9859805644)_%E2%80%93_edited.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg/300px-MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg" decoding="async" width="300" height="194" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg/450px-MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg/600px-MR_4-2-2_673%2C_Rocket_150%2C_Rainhill%2C_May_1980_Slides184_%289859805644%29_%E2%80%93_edited.jpg 2x" data-file-width="1481" data-file-height="956" /></a><figcaption>The <a href="/wiki/Midland_Railway_115_Class" title="Midland Railway 115 Class">Midland Railway 115 Class</a> 4-2-2</figcaption></figure> <p>Under the <a href="/wiki/Whyte_notation" title="Whyte notation">Whyte notation</a> for the classification of <a href="/wiki/Steam_locomotive" title="Steam locomotive">steam locomotives</a>, <b>4-2-2</b> represents the <a href="/wiki/Wheel_arrangement" title="Wheel arrangement">wheel arrangement</a> of four <a href="/wiki/Leading_wheel" title="Leading wheel">leading wheels</a> on two axles, two powered <a href="/wiki/Driving_wheel" title="Driving wheel">driving wheels</a> on one axle, and two <a href="/wiki/Trailing_wheel" title="Trailing wheel">trailing wheels</a> on one axle. </p><p>Other equivalent classifications are: </p> <dl><dd><a href="/wiki/UIC_classification" class="mw-redirect" title="UIC classification">UIC classification</a>: <b>2A1</b></dd> <dd><a href="/wiki/French_classification" class="mw-redirect" title="French classification">French classification</a>: <b>211</b></dd> <dd><a href="/wiki/Turkish_classification" class="mw-redirect" title="Turkish classification">Turkish classification</a>: <b>14</b></dd> <dd><a href="/wiki/Swiss_classification" class="mw-redirect" title="Swiss classification">Swiss classification</a>: <b>1/4</b></dd></dl> <p>Like other steam locomotive types with single pairs of driving wheels, they were also known as <b>singles</b>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Borsig.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/Borsig.jpg/220px-Borsig.jpg" decoding="async" width="220" height="162" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/Borsig.jpg/330px-Borsig.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/50/Borsig.jpg/440px-Borsig.jpg 2x" data-file-width="1650" data-file-height="1217" /></a><figcaption>Technical drawing of the first Borsig locomotive</figcaption></figure> <p>The 4-2-2 configuration offered designers eight wheels to spread the weight of a larger locomotive, but prior to the <a href="/wiki/Bogie" title="Bogie">bogies</a> (invented in the 1830s) becoming popular, created a long rigid <a href="/wiki/Wheelbase" title="Wheelbase">wheelbase</a> with limited <a href="/wiki/Adhesion" title="Adhesion">adhesion</a>. As a result, the type was relatively rare until the 1870s. The first steam locomotive made by <a href="/wiki/Borsig" title="Borsig">Borsig</a> of <a href="/wiki/Berlin" title="Berlin">Berlin</a> in 1841, the <i>Borsig</i> No 1, was a 4-2-2, but the company quickly reverted to the more common <a href="/wiki/2-2-2" title="2-2-2">2-2-2</a> configuration. </p> <div class="mw-heading mw-heading3"><h3 id="UK_developments">UK developments</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=2" title="Edit section: UK developments"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/London_and_North_Western_Railway" title="London and North Western Railway">London and North Western Railway</a> No. 3020 <a href="/wiki/LNWR_2-2-2_3020_Cornwall" title="LNWR 2-2-2 3020 Cornwall">Cornwall</a> was built as 4-2-2 at <a href="/wiki/Crewe_Works" title="Crewe Works">Crewe Works</a> in 1847, but was extensively rebuilt, and converted to a 2-2-2 in 1858. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:GWR_broad_gauge_locomotives.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/69/GWR_broad_gauge_locomotives.jpg/220px-GWR_broad_gauge_locomotives.jpg" decoding="async" width="220" height="137" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/69/GWR_broad_gauge_locomotives.jpg/330px-GWR_broad_gauge_locomotives.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/69/GWR_broad_gauge_locomotives.jpg/440px-GWR_broad_gauge_locomotives.jpg 2x" data-file-width="554" data-file-height="346" /></a><figcaption><a href="/wiki/GWR_Iron_Duke_Class" class="mw-redirect" title="GWR Iron Duke Class">Iron Duke</a> class engines waiting to be scrapped</figcaption></figure> <p>The one area where the type proved to be useful was on <a href="/wiki/Broad_gauge" class="mw-redirect" title="Broad gauge">broad gauge</a> locomotives, where sharp bends were less of an issue. <a href="/wiki/Daniel_Gooch" title="Daniel Gooch">Daniel Gooch</a> built 29 examples of his <a href="/wiki/GWR_Iron_Duke_Class" class="mw-redirect" title="GWR Iron Duke Class">Iron Duke</a> express locomotive class for the <a href="/wiki/Great_Western_Railway" title="Great Western Railway">Great Western Railway</a> between 1847 and 1855.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> They had an 8 ft (2.4 m) diameter <a href="/wiki/Driving_wheel" title="Driving wheel">driving wheel</a> size. Twenty examples of a similar <a href="/wiki/Bristol_and_Exeter_Railway_4-2-2_locomotives" title="Bristol and Exeter Railway 4-2-2 locomotives">design</a> were built for the <a href="/wiki/Bristol_and_Exeter_Railway" title="Bristol and Exeter Railway">Bristol and Exeter Railway</a> after 1849, by <a href="/wiki/Avonside_Engine_Company" title="Avonside Engine Company">Stothert & Slaughter</a> in <a href="/wiki/Bristol" title="Bristol">Bristol</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Because both sets of leading wheels are mounted independently in the frames in these classes, they are sometimes described as (2-2)-2-2 rather than 4-2-2.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>The first 4-2-2 to have a bogie was built by <a href="/wiki/Archibald_Sturrock" title="Archibald Sturrock">Archibald Sturrock</a> of the <a href="/wiki/Great_Northern_Railway_(England)" class="mw-redirect" title="Great Northern Railway (England)">Great Northern Railway</a> (GNR) in 1853. This had 7 ft 0 in (2.134 m) <a href="/wiki/Flangeless_driver" class="mw-redirect" title="Flangeless driver">flangeless driving wheels</a>, and was only moderately successful, having a tendency to derail.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> By the 1870s, improved design of bogies giving more flexibility enabled designers to create fast standard gauge express passenger locomotives of this type. On the GNR, <a href="/wiki/Patrick_Stirling_(railway_engineer)" title="Patrick Stirling (railway engineer)">Patrick Stirling</a> built <a href="/wiki/GNR_Stirling_4-2-2" title="GNR Stirling 4-2-2">53 examples</a> with <a href="/wiki/Cylinder_(locomotive)#Inside_or_outside_cylinders" title="Cylinder (locomotive)">outside cylinders</a> at <a href="/wiki/Doncaster_Works" title="Doncaster Works">Doncaster Works</a> between 1870 and 1895, for use on the <a href="/wiki/East_Coast_Main_Line" title="East Coast Main Line">East Coast Main Line</a> between <a href="/wiki/London_King%27s_Cross_railway_station" title="London King's Cross railway station">London King's Cross</a> and <a href="/wiki/York_railway_station" title="York railway station">York</a>. They ran at an average speed of more than 60 mph (97 km/h) during the <a href="/wiki/Race_to_the_north" class="mw-redirect" title="Race to the north">race to the north</a>, and were called <i>eight-footers</i> because of the <a href="/wiki/Driving_wheel" title="Driving wheel">driving wheel</a>, that was more than 8 ft (2.4 m) in diameter. Stirling's successor <a href="/wiki/Henry_Ivatt" title="Henry Ivatt">Henry Ivatt</a> built a further twelve singles between 1898 and 1901 before moving on to larger <a href="/wiki/4-4-2_(locomotive)" title="4-4-2 (locomotive)">4-4-2</a> designs. </p><p>The attraction of the 'single' (4-2-2 or otherwise) was that, thanks to the 'gearing' effect of the large single driving wheels, a locomotive could obtain high speeds while the operating speed of the engine's <a href="/wiki/Piston" title="Piston">pistons</a> and <a href="/wiki/Valve_gear" title="Valve gear">valve gear</a> remained relatively low. This was important because of the relatively unsophisticated lubrication systems available at the time, with many of the parts of the engine's motion requiring to be 'oiled round' with the locomotive stationary before and after a run, or on longer trips by one of the crew taking to the <a href="/wiki/Running_board" title="Running board">running board</a> to oil the required parts while on the move. Low piston speed also meant that the steam demand on the boiler would be relatively low, allowing a smaller, lighter boiler. </p><p>Before the development of the 'large boiler' designs in the 1890s, many boilers could not sustain the steam supply required of a small-wheeled locomotive operating at speed, thus requiring the large driving wheels of a single. At 70 mph (110 km/h), an 'eight-footer' single's driving wheels would be revolving at 245 revolutions per minute, opposed to the 327 revolutions of the driving wheels of a 'six-footer'. A locomotive with coupled wheels also suffered extra rolling resistance from the presence of <a href="/wiki/Coupling_rod" title="Coupling rod">coupling rods</a> between the driving wheels which incurred a slight but measurable resistance arising from the small variances in the diameter of the driving wheels that were nominally of the same size. This meant that without the coupling rods, for a given locomotive speed the driving wheels would turn at very slightly different rate, but the coupling rods and the axles forced the driving wheels to turn at the same speed, with the added work being incurred as a binding force in the coupling rod bearings. Aside from this force, the coupling rod bearings themselves were a source of rolling resistance. Additionally, each driving axle of a locomotive had to be supported on large <a href="/wiki/Plain_bearing" title="Plain bearing">plain bearings</a>, with required further lubrication, introducing a potential point of mechanical failure through <a href="/wiki/Hot_box" title="Hot box">overheating</a> and a considerable source of friction. With only one driving axle, a 'single' had much less rolling resistance than a four-coupled engine, requiring less steam to achieve a given speed and also being more free-running when coasting downhill. </p><p>The 4-2-2 wheel arrangement had other specific advantages - the front <a href="/wiki/Bogie" title="Bogie">bogie</a> supported the weight of large cylinders and a long boiler which could exceed the load limits on a single front axle while also providing a superior stability and cornering at high speeds. Without restriction from a rear driving axle and wheels, a wide and deep <a href="/wiki/Firebox_(steam_engine)" title="Firebox (steam engine)">firebox</a> could be used, carried by the small single trailing axle, which provided good steam-making properties and a large ashpan making these locomotives suitable for running long distances at high speeds. </p><p>The Stirling 'eight-footers' were very successful, but were best suited to the predominantly straight and flat GNR <a href="/wiki/East_Coast_Main_Line" title="East Coast Main Line">main line</a> in <a href="/wiki/Cambridgeshire" title="Cambridgeshire">Cambridgeshire</a> and the <a href="/wiki/Vale_of_York" title="Vale of York">Vale of York</a>. Other railways slowly replaced their original 'singles' with <a href="/wiki/4-4-0" title="4-4-0">4-4-0</a> locomotives that offered better traction at the cost of ultimate speed. However, in 1886 Francis Holt, manager at the <a href="/wiki/Derby_Works" title="Derby Works">Derby Works</a> of the <a href="/wiki/Midland_Railway" title="Midland Railway">Midland Railway</a> invented a practical form of <a href="/wiki/Sandbox_(locomotive)#Steam_sanding" title="Sandbox (locomotive)">steam sanding gear</a> which allowed locomotive crews to quickly and effectively stop wheelspin. This led to the Midland reviving the 'single' in the form of the distinctive <a href="/wiki/Cylinder_(locomotive)#Inside_or_outside_cylinders" title="Cylinder (locomotive)">inside-cylinder</a> "Spinners"; eighty-five were built to five designs by <a href="/wiki/Samuel_Waite_Johnson" title="Samuel Waite Johnson">Samuel Waite Johnson</a> between 1887 and 1900.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> One <a href="/wiki/Midland_Railway_115_Class" title="Midland Railway 115 Class">115 class</a>, No. 673, survives at the <a href="/wiki/National_Railway_Museum" title="National Railway Museum">National Railway Museum</a> in York. Concurrent with Holt's invention was the so-called <a href="/wiki/Race_to_the_North" title="Race to the North">Race to the North</a>, when groups of railway companies on the <a href="/wiki/East_Coast_Main_Line" title="East Coast Main Line">East Coast</a> and <a href="/wiki/West_Coast_Main_Line" title="West Coast Main Line">West Coast</a> routes between London and Edinburgh competed with each for the fastest journey times. For its portion of the West Coast route, the <a href="/wiki/Caledonian_Railway" title="Caledonian Railway">Caledonian Railway</a> used its unique 4-2-2, <a href="/wiki/Caledonian_Railway_Single" title="Caledonian Railway Single">No. 123</a>. This had been built in 1885 as a showpiece for the 1886 <a href="/wiki/International_Exhibition_of_Industry,_Science_and_Art" title="International Exhibition of Industry, Science and Art">world's fair in Edinburgh</a> rather than to fulfil a traffic need for the railway, and so had used the now-unfashionable 4-2-2 'Single' layout. But when pressed into service during the Race to the North, No. 123's high speed performance and reliability made other locomotive engineers reconsider the advantages of the single-driver engine, especially when joined with the new steam-sander (No. 123 had a similar sanding system working by compressed air). </p><p>These factors lead to a resurgence of interest in the 'single' for fast express passenger work in the 1880s and 1890s. <a href="/wiki/William_Dean_(engineer)" title="William Dean (engineer)">William Dean</a> of the Great Western Railway built fifty examples of the standard gauge <a href="/wiki/GWR_3031_Class" title="GWR 3031 Class">3031</a> <i>Achilles</i> Class from 1893 to 1899.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> <a href="/wiki/GWR_3031_Class#Notable_members_of_the_class" title="GWR 3031 Class">No. 3065 <i>Duke of Connaught</i></a> contributed to the record-breaking run of the <i><a href="/w/index.php?title=Ocean_Mail&action=edit&redlink=1" class="new" title="Ocean Mail (page does not exist)">Ocean Mail</a></i> express train from Plymouth to Paddington in 227 minutes on 9 May 1904, when it took over the train at Bristol from <a href="/wiki/GWR_3700_Class_3440_City_of_Truro" title="GWR 3700 Class 3440 City of Truro">No 3440 <i>City of Truro</i></a> and completed the journey to Paddington in 99 minutes 46 seconds. By 1900, average train loads had grown beyond the capability of even a sander-fitted 'single' and their development was stopped. On the GNR, Stirling's famous 'eight-footers' required <a href="/wiki/Double_heading" title="Double heading">double heading</a> with 4-4-0s before they were replaced by the <a href="/wiki/GNR_Class_C1_(small_boiler)" title="GNR Class C1 (small boiler)">'Klondyke' 4-4-2</a> engines designed by <a href="/wiki/Henry_Ivatt" title="Henry Ivatt">Henry Ivatt</a>, while on the Midland Railway Samuel Johnson developed a powerful compound 4-4-0 to replace his 'Spinners'. </p><p>Other notable <a href="/wiki/UK" class="mw-redirect" title="UK">UK</a> examples of the 4-2-2 include the <a href="/wiki/GER_Class_P43" title="GER Class P43">GER Class P43</a>, which was an early <a href="/wiki/Oil" title="Oil">oil</a>-burning engine, developed by the pioneer of <a href="/wiki/Oil" title="Oil">oil</a>-<a href="/wiki/Boilers" class="mw-redirect" title="Boilers">boilers</a>, <a href="/wiki/James_Holden_(engineer)" class="mw-redirect" title="James Holden (engineer)">James Holden</a>. The last British 'single' to be designed was the Class 13 of the <a href="/wiki/Great_Central_Railway" title="Great Central Railway">Great Central Railway</a>, designed by <a href="/wiki/Harry_Pollitt_(engineer)" title="Harry Pollitt (engineer)">Harry Pollitt</a> in 1900 for work on the company's new <a href="/wiki/Great_Central_Main_Line" title="Great Central Main Line">main line</a> to London. Ivatt Class A5 singles of the GNR, designed before the Great Central engines, continued to enter service during 1901, being the last of their type to take to the rails in Britain. </p> <div class="mw-heading mw-heading3"><h3 id="US_developments">US developments</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=3" title="Edit section: US developments"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Judah.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/91/Judah.jpg/220px-Judah.jpg" decoding="async" width="220" height="99" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/91/Judah.jpg/330px-Judah.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/91/Judah.jpg/440px-Judah.jpg 2x" data-file-width="640" data-file-height="289" /></a><figcaption><i><a href="/wiki/T._D._Judah" title="T. D. Judah">T. D. Judah</a></i>, a locomotive rebuilt as a 4-2-2 by <a href="/wiki/Central_Pacific_Railroad" title="Central Pacific Railroad">Central Pacific Railroad</a>.</figcaption></figure> <p>The <a href="/wiki/T._D._Judah" title="T. D. Judah">T. D. Judah</a> locomotive was built as a <a href="/wiki/4-2-4T" title="4-2-4T">4-2-4</a> by the <a href="/wiki/Cooke_Locomotive_and_Machine_Works" title="Cooke Locomotive and Machine Works">Cooke Locomotive and Machine Works</a> in 1863. It was purchased for use on the <a href="/wiki/Central_Pacific_Railroad" title="Central Pacific Railroad">Central Pacific Railroad</a> and was rebuilt as a 4-2-2 in 1872. </p><p>By 1900, typical loads on express trains had grown beyond the capabilities of 4-2-2 locomotives and the configuration was superseded by the <a href="/wiki/4-4-2_(locomotive)" title="4-4-2 (locomotive)">4-4-2</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Asia">Asia</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=4" title="Edit section: Asia"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1910, the British locomotive manufacturer <a href="/wiki/Kerr,_Stuart_and_Company" title="Kerr, Stuart and Company">Kerr, Stuart and Company</a> produced four 4-2-2 locomotives, weighing 120 tons and with 7 ft driving wheels, for the <a href="/wiki/Shanghai%E2%80%93Nanjing_railway" title="Shanghai–Nanjing railway">Shanghai–Nanjing railway</a>.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> These were the last recorded 'singles' built and almost certainly the largest. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Bertram Baxter, British Locomotive Catalogue 1825-1923, Vol.1, Moorland Publishing, (1977), p. 55.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">Baxter (1977), p. 53.</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Science Museum, The British Railway Locomotive 1803-153, H.M.S.O., 1958, p.14.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFCasserley1960" class="citation book cs1">Casserley, H.C. (1960). <i>Historic locomotive pocket book</i>. London: Batsford. pp. 15–16.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Historic+locomotive+pocket+book&rft.place=London&rft.pages=15-16&rft.pub=Batsford&rft.date=1960&rft.aulast=Casserley&rft.aufirst=H.C.&rfr_id=info%3Asid%2Fen.wikipedia.org%3A4-2-2" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">Baxter (1977), p. 55.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text">Baxter (1977), p. 57.</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFO_S_Nock" class="citation book cs1"><a href="/wiki/O._S._Nock" title="O. S. Nock">O S Nock</a>. <i>Railways at the Turn of the Century, 1895-1905</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Railways+at+the+Turn+of+the+Century%2C+1895-1905&rft.au=O+S+Nock&rfr_id=info%3Asid%2Fen.wikipedia.org%3A4-2-2" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.steamlocomotive.com/locobase.php?country=China&wheel=4-2-2&railroad=shanghai-nanking#2665">"Shanghai-Nanking 4-2-2 Locomotives in China"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Shanghai-Nanking+4-2-2+Locomotives+in+China&rft_id=https%3A%2F%2Fwww.steamlocomotive.com%2Flocobase.php%3Fcountry%3DChina%26wheel%3D4-2-2%26railroad%3Dshanghai-nanking%232665&rfr_id=info%3Asid%2Fen.wikipedia.org%3A4-2-2" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=4-2-2&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWinchester1936" class="citation cs2">Winchester, Clarence, ed. (1936), <a rel="nofollow" class="external text" href="http://www.railwaywondersoftheworld.com/singles.html">"Some famous singles"</a>, <i>Railway Wonders of the World</i>, pp. 1091–1099</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Some+famous+singles&rft.btitle=Railway+Wonders+of+the+World&rft.pages=1091-1099&rft.date=1936&rft_id=http%3A%2F%2Fwww.railwaywondersoftheworld.com%2Fsingles.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3A4-2-2" class="Z3988"></span> illustrated description of some famous singles</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline 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navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Whyte_types" title="Template:Whyte types"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Whyte_types" title="Template talk:Whyte types"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Whyte_types" title="Special:EditPage/Template:Whyte types"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Steam_locomotive_wheel_arrangements_(Whyte_notation)" style="font-size:114%;margin:0 4em"><a href="/wiki/Whyte_notation" title="Whyte notation">Steam locomotive wheel arrangements (Whyte notation)</a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%">Single engine types</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/0-2-2" title="0-2-2">0-2-2</a></li> <li><a href="/wiki/0-2-4" title="0-2-4">0-2-4</a></li> <li><a href="/wiki/2-2-0" title="2-2-0">2-2-0</a></li> <li><a href="/wiki/2-2-2" title="2-2-2">2-2-2</a></li> <li><a href="/wiki/2-2-4T" title="2-2-4T">2-2-4T</a></li> <li><a href="/wiki/4-2-0" title="4-2-0">4-2-0</a></li> <li><a class="mw-selflink selflink">4-2-2</a></li> <li><a href="/wiki/4-2-4T" title="4-2-4T">4-2-4T</a></li> <li><a href="/wiki/6-2-0" title="6-2-0">6-2-0</a></li></ul> <ul><li><a href="/wiki/0-3-0" title="0-3-0">0-3-0</a> (monorail)</li></ul> <ul><li><a href="/wiki/0-4-0" title="0-4-0">0-4-0</a></li> <li><a href="/wiki/0-4-0%2B4" title="0-4-0+4">0-4-0+4</a></li> <li><a href="/wiki/0-4-2" title="0-4-2">0-4-2</a></li> <li><a href="/wiki/0-4-4T" title="0-4-4T">0-4-4T</a></li> <li><a href="/wiki/0-4-6T" title="0-4-6T">0-4-6T</a></li> <li><a href="/wiki/2-4-0" title="2-4-0">2-4-0</a></li> <li><a href="/wiki/2-4-2" title="2-4-2">2-4-2</a></li> <li><a href="/wiki/2-4-4T" title="2-4-4T">2-4-4T</a></li> <li><a href="/wiki/2-4-6T" title="2-4-6T">2-4-6T</a></li> <li><a href="/wiki/4-4-0" title="4-4-0">4-4-0</a></li> <li><a href="/wiki/4-4-2_(locomotive)" title="4-4-2 (locomotive)">4-4-2</a></li> <li><a href="/wiki/4-4-4" title="4-4-4">4-4-4</a></li> <li><a href="/wiki/4-4-6" title="4-4-6">4-4-6</a></li></ul> <ul><li><a href="/wiki/0-6-0" title="0-6-0">0-6-0</a></li> <li><a href="/wiki/0-6-2" title="0-6-2">0-6-2</a></li> <li><a href="/wiki/0-6-4T" title="0-6-4T">0-6-4T</a></li> <li><a href="/wiki/0-6-6T" title="0-6-6T">0-6-6T</a></li> <li><a href="/wiki/2-6-0" title="2-6-0">2-6-0</a></li> <li><a href="/wiki/2-6-2" title="2-6-2">2-6-2</a></li> <li><a href="/wiki/2-6-4" title="2-6-4">2-6-4</a></li> <li><a href="/wiki/2-6-6T" title="2-6-6T">2-6-6T</a></li> <li><a href="/wiki/4-6-0" title="4-6-0">4-6-0</a></li> <li><a href="/wiki/4-6-2" title="4-6-2">4-6-2</a></li> <li><a href="/wiki/4-6-4" title="4-6-4">4-6-4</a></li></ul> <ul><li><a href="/wiki/0-8-0" title="0-8-0">0-8-0</a></li> <li><a href="/wiki/0-8-2" title="0-8-2">0-8-2</a></li> <li><a href="/wiki/0-8-4T" title="0-8-4T">0-8-4T</a></li> <li><a href="/wiki/0-8-6" class="mw-redirect" title="0-8-6">0-8-6</a></li> <li><a href="/wiki/2-8-0" title="2-8-0">2-8-0</a></li> <li><a href="/wiki/2-8-2" title="2-8-2">2-8-2</a></li> <li><a href="/wiki/2-8-4" title="2-8-4">2-8-4</a></li> <li><a href="/wiki/2-8-6" class="mw-redirect" title="2-8-6">2-8-6</a></li> <li><a href="/wiki/4-8-0" title="4-8-0">4-8-0</a></li> <li><a href="/wiki/4-8-2" title="4-8-2">4-8-2</a></li> <li><a href="/wiki/4-8-4" title="4-8-4">4-8-4</a></li> <li><a href="/wiki/4-8-6" title="4-8-6">4-8-6</a></li> <li><a href="/wiki/6-8-6" title="6-8-6">6-8-6</a></li></ul> <ul><li><a href="/wiki/0-10-0" title="0-10-0">0-10-0</a></li> <li><a href="/wiki/0-10-2" title="0-10-2">0-10-2</a></li> <li><a href="/wiki/2-10-0" title="2-10-0">2-10-0</a></li> <li><a href="/wiki/2-10-2" title="2-10-2">2-10-2</a></li> <li><a href="/wiki/2-10-4" title="2-10-4">2-10-4</a></li> <li><a href="/wiki/4-10-0" title="4-10-0">4-10-0</a></li> <li><a href="/wiki/4-10-2" title="4-10-2">4-10-2</a></li></ul> <ul><li><a href="/wiki/0-12-0" title="0-12-0">0-12-0</a></li> <li><a href="/wiki/2-12-0" title="2-12-0">2-12-0</a></li> <li><a href="/wiki/2-12-2" title="2-12-2">2-12-2</a></li> <li><a href="/wiki/2-12-4T" title="2-12-4T">2-12-4</a></li> <li><a href="/wiki/Union_Pacific_9000_Class" title="Union Pacific 9000 Class">4-12-2</a></li></ul> <ul><li><a href="/wiki/Soviet_locomotive_class_AA20" title="Soviet locomotive class AA20">4-14-4</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Divided_drive_(locomotive)" title="Divided drive (locomotive)">Divided drive</a> and <br /><a href="/wiki/Duplex_locomotive" title="Duplex locomotive">Duplex</a> engine types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/0-2-2-0" title="0-2-2-0">0-2-2-0</a></li> <li><a href="/wiki/2-2-2-0" title="2-2-2-0">2-2-2-0</a></li> <li><a href="/wiki/2-2-2-2" title="2-2-2-2">2-2-2-2</a></li> <li><a href="/wiki/2-2-4-0T" title="2-2-4-0T">2-2-4-0T</a></li> <li><a href="/wiki/4-2-2-0" title="4-2-2-0">4-2-2-0</a></li></ul> <ul><li><a href="/wiki/2-4-6-2" title="2-4-6-2">2-4-6-2</a></li> <li><a href="/wiki/4-4-4-4" title="4-4-4-4">4-4-4-4</a></li> <li><a href="/wiki/6-4-4-6" title="6-4-4-6">6-4-4-6</a></li> <li><a href="/wiki/4-4-6-4" title="4-4-6-4">4-4-6-4</a></li> <li><a href="/wiki/4-6-4-4" title="4-6-4-4">4-6-4-4</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Articulated_locomotive" title="Articulated locomotive">Articulated locomotives</a> <br /><a href="/wiki/Fairlie_locomotive" title="Fairlie locomotive">Fairlie</a>, <a href="/wiki/Meyer_locomotive" title="Meyer locomotive">Meyer</a> <br />and <a href="/wiki/Garratt_locomotive" title="Garratt locomotive">Garratt</a> types</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/0-4-0%2B0-4-0" title="0-4-0+0-4-0">0-4-0+0-4-0</a></li> <li><a href="/wiki/2-4-0%2B0-4-2" title="2-4-0+0-4-2">2-4-0+0-4-2</a></li> <li><a href="/wiki/2-4-2%2B2-4-2" title="2-4-2+2-4-2">2-4-2+2-4-2</a></li> <li><a href="/wiki/4-4-2%2B2-4-4" title="4-4-2+2-4-4">4-4-2+2-4-4</a></li></ul> <ul><li><a href="/wiki/0-6-0%2B0-6-0" title="0-6-0+0-6-0">0-6-0+0-6-0</a></li> <li><a href="/wiki/0-6-2%2B2-6-0" class="mw-redirect" title="0-6-2+2-6-0">0-6-2+2-6-0</a></li> <li><a href="/wiki/2-6-0%2B0-6-2" title="2-6-0+0-6-2">2-6-0+0-6-2</a></li> <li><a href="/wiki/2-6-2%2B2-6-2" title="2-6-2+2-6-2">2-6-2+2-6-2</a></li> <li><a href="/wiki/4-6-0%2B0-6-4" title="4-6-0+0-6-4">4-6-0+0-6-4</a></li> <li><a href="/wiki/4-6-2%2B2-6-4" title="4-6-2+2-6-4">4-6-2+2-6-4</a></li> <li><a href="/wiki/4-6-4%2B4-6-4" title="4-6-4+4-6-4">4-6-4+4-6-4</a></li></ul> <ul><li><a href="/wiki/2-8-0%2B0-8-2" title="2-8-0+0-8-2">2-8-0+0-8-2</a></li> <li><a href="/wiki/2-8-2%2B2-8-2" title="2-8-2+2-8-2">2-8-2+2-8-2</a></li> <li><a href="/wiki/4-8-0%2B0-8-4" title="4-8-0+0-8-4">4-8-0+0-8-4</a></li> <li><a href="/wiki/4-8-2%2B2-8-4" title="4-8-2+2-8-4">4-8-2+2-8-4</a></li> <li><a href="/wiki/4-8-4%2B4-8-4" title="4-8-4+4-8-4">4-8-4+4-8-4</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Articulated_locomotive" title="Articulated locomotive">Articulated locomotives</a> <br /><a href="/wiki/Mallet_locomotive" title="Mallet locomotive">Mallet</a> types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/0-4-4-0" title="0-4-4-0">0-4-4-0</a></li> <li><a href="/wiki/0-4-4-2" title="0-4-4-2">0-4-4-2</a></li> <li><a href="/wiki/2-4-4-0" title="2-4-4-0">2-4-4-0</a></li> <li><a href="/wiki/2-4-4-2" title="2-4-4-2">2-4-4-2</a></li></ul> <ul><li><a href="/wiki/0-6-6-0" title="0-6-6-0">0-6-6-0</a></li> <li><a href="/wiki/2-6-6-0" title="2-6-6-0">2-6-6-0</a></li> <li><a href="/wiki/2-6-6-2" title="2-6-6-2">2-6-6-2</a></li> <li><a href="/wiki/2-6-6-4" title="2-6-6-4">2-6-6-4</a></li> <li><a href="/wiki/2-6-6-6" title="2-6-6-6">2-6-6-6</a></li> <li><a href="/wiki/2-6-8-0" title="2-6-8-0">2-6-8-0</a></li> <li><a href="/wiki/4-4-6-2" title="4-4-6-2">4-4-6-2</a></li> <li><a href="/wiki/4-6-6-2" title="4-6-6-2">4-6-6-2</a></li> <li><a href="/wiki/4-6-6-4" title="4-6-6-4">4-6-6-4</a></li></ul> <ul><li><a href="/wiki/0-8-6-0" class="mw-redirect" title="0-8-6-0">0-8-6-0</a></li> <li><a href="/wiki/0-8-8-0" title="0-8-8-0">0-8-8-0</a></li> <li><a href="/wiki/2-8-8-0" title="2-8-8-0">2-8-8-0</a></li> <li><a href="/wiki/2-8-8-2" title="2-8-8-2">2-8-8-2</a></li> <li><a href="/wiki/2-8-8-4" title="2-8-8-4">2-8-8-4</a></li> <li><a href="/wiki/4-8-8-2" title="4-8-8-2">4-8-8-2</a></li> <li><a href="/wiki/4-8-8-4" title="4-8-8-4">4-8-8-4</a></li></ul> <ul><li><a href="/wiki/2-10-10-2" title="2-10-10-2">2-10-10-2</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Articulated_locomotive" title="Articulated locomotive">Articulated locomotives</a> <br /><a href="/wiki/Triplex_locomotive" title="Triplex locomotive">Triplex</a> and other <a href="/wiki/Multiplex_locomotive" title="Multiplex locomotive">Multiplex</a> types</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/2-8-8-8-2" class="mw-redirect" title="2-8-8-8-2">2-8-8-8-2</a></li> <li><a href="/wiki/2-8-8-8-4" title="2-8-8-8-4">2-8-8-8-4</a></li></ul> <ul><li><a href="/wiki/Multiplex_locomotive#United_States" title="Multiplex locomotive">2-8-8-8-8-2</a></li> <li><a href="/wiki/Multiplex_locomotive#Belgium" title="Multiplex locomotive">0-6-2+2-4-2-4-2+2-6-0</a></li> <li><a href="/wiki/Multiplex_locomotive#Super-Garratt" title="Multiplex locomotive">2-6-6-2+2-6-6-2</a></li></ul> <ul><li><a href="/wiki/Multiplex_locomotive#Quintuplex_locomotives" title="Multiplex locomotive">2-8-8-8-8-8-2</a></li> <li><a href="/wiki/Multiplex_locomotive#Quintuplex_locomotives" title="Multiplex locomotive">2-10-10-10-10-10-2</a></li></ul> <ul><li><a href="/wiki/Multiplex_locomotive#Hexaplex_locomotive" title="Multiplex locomotive">2-4-4-2+2-8-8-2+2-4-4-2</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Articulated_locomotive" title="Articulated locomotive">Articulated locomotives</a><br /><a href="/wiki/Engerth_locomotive" title="Engerth locomotive">Engerth</a> types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/0-4-4T" title="0-4-4T">0-4-4</a></li> <li><a href="/wiki/0-4-6" class="mw-redirect" title="0-4-6">0-4-6</a></li></ul> <ul><li><a href="/wiki/2-6-4" title="2-6-4">2-6-4</a></li> <li><a href="/wiki/0-6-4" class="mw-redirect" title="0-6-4">0-6-4</a></li> <li><a href="/wiki/Co-Bo" title="Co-Bo">0-6-4-0</a></li></ul> <ul><li><a href="/wiki/0-8-4T" title="0-8-4T">0-8-4</a></li> <li><a href="/wiki/0-8-6" class="mw-redirect" title="0-8-6">0-8-6</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#edd4bd;;width:1%"><a href="/wiki/Geared_locomotive" class="mw-redirect" title="Geared locomotive">Geared locomotives</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Shay_locomotive" title="Shay locomotive">Shay</a></li> <li><a href="/wiki/Climax_locomotive" title="Climax locomotive">Climax</a></li> <li><a href="/wiki/Heisler_locomotive" title="Heisler locomotive">Heisler</a></li> <li><a href="/wiki/Willamette_locomotive" title="Willamette locomotive">Willamette</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background:#edd4bd;"><div> <ul><li>Other notation forms: <a href="/wiki/AAR_wheel_arrangement" title="AAR wheel arrangement">AAR</a></li> <li><a href="/wiki/Swiss_locomotive_and_railcar_classification" title="Swiss locomotive and railcar classification">Swiss</a></li> <li><a href="/wiki/UIC_classification_of_locomotive_axle_arrangements" title="UIC classification of locomotive axle arrangements">UIC</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" 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