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Double heading - Wikipedia
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class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=Double-heading&redirect=no" class="mw-redirect" title="Double-heading">Double-heading</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px 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role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Double_heading" title="Special:EditPage/Double heading">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Double+heading%22">"Double heading"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Double+heading%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Double+heading%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Double+heading%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Double+heading%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Double+heading%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">October 2022</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Double-heading-train.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Double-heading-train.svg/220px-Double-heading-train.svg.png" decoding="async" width="220" height="57" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/Double-heading-train.svg/330px-Double-heading-train.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/03/Double-heading-train.svg/440px-Double-heading-train.svg.png 2x" data-file-width="690" data-file-height="180" /></a><figcaption>When double-heading a train, two locomotives are used at the same end—historically with separate <a href="/wiki/Crew" title="Crew">crews</a>.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Railroad1860.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Railroad1860.jpg/220px-Railroad1860.jpg" decoding="async" width="220" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Railroad1860.jpg/330px-Railroad1860.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Railroad1860.jpg/440px-Railroad1860.jpg 2x" data-file-width="1256" data-file-height="1024" /></a><figcaption>A double headed <a href="/wiki/United_States" title="United States">U.S.</a> <a href="/wiki/Passenger_train" title="Passenger train">passenger train</a> of the 1860s at <a href="/wiki/Dale_Creek_Crossing" title="Dale Creek Crossing">Dale Creek Crossing</a> near <a href="/wiki/Sherman,_Wyoming" title="Sherman, Wyoming">Sherman</a> in southeastern <a href="/wiki/Wyoming" title="Wyoming">Wyoming</a></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:SteamAcrossIowaRiver.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/SteamAcrossIowaRiver.JPG/220px-SteamAcrossIowaRiver.JPG" decoding="async" width="220" height="143" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/10/SteamAcrossIowaRiver.JPG/330px-SteamAcrossIowaRiver.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/10/SteamAcrossIowaRiver.JPG/440px-SteamAcrossIowaRiver.JPG 2x" data-file-width="2000" data-file-height="1300" /></a><figcaption>A double headed steam <a href="/wiki/Excursion_train" title="Excursion train">excursion train</a> in <a href="/wiki/Iowa" title="Iowa">Iowa</a>, September 2006</figcaption></figure> <p>In <a href="/wiki/Railroad_terminology" class="mw-redirect" title="Railroad terminology">railroad terminology</a>, <b>double heading</b> indicates the use of two <a href="/wiki/Locomotive" title="Locomotive">locomotives</a> at the front of a <a href="/wiki/Train" title="Train">train</a>,<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> each operated individually by its own crew. The practice of triple-heading involves the use of three locomotives. The practice of multi-heading involves the use of multiple locomotives and so on. </p><p>Double heading is most common with steam locomotives, but is also practised with diesel locomotives. It is not strictly the same practice as two or more diesel or electric locomotives working '<a href="/wiki/Multiple-unit_train_control" title="Multiple-unit train control">in multiple</a>' (or 'multiple-working'), where both (or all) locomotives are controlled by a single driver in the cab of the leading locomotive. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Advantages">Advantages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_heading&action=edit&section=1" title="Edit section: Advantages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Double heading is practised for a number of reasons: </p> <ul><li>In the UK it was usually to gain traction on steep inclines, twice the amount of driven wheels – twice the amount of grip.</li> <li>The need for additional motive power when a single locomotive is unable to haul the train due to uphill grades, excessive train weight, or a combination of the two.</li> <li>Double heading is also used on passenger trains when one locomotive could suffice but would not be fast enough to maintain the schedule.</li> <li>More rarely, certain companies have used double-heading to guarantee a service when they have been aware of the poor quality of their locomotives, on the understanding that if one engine failed in service, the other would suffice to get the train to its destination.</li> <li>Double heading is a useful practice on single lines even in the absence of a need for more power, as to double-head a train saves making a separate path for a spare engine; it can be repositioned using the traffic path occupied by the service train.</li> <li>As double heading has become increasingly uncommon railway companies may advertise specially double-headed services as an attraction to enthusiasts; this occurs regularly but infrequently on the British mainline, whilst the <a href="/wiki/Romney,_Hythe_%26_Dymchurch_Railway" class="mw-redirect" title="Romney, Hythe & Dymchurch Railway">Romney, Hythe & Dymchurch Railway</a> in England advertises an annual day when all of its passenger trains are double-headed all day, both steam and diesel.</li> <li>In the United Kingdom, double-heading is used to provide <a href="/wiki/Redundancy_(engineering)" title="Redundancy (engineering)">redundancy</a> for all trains hauling <a href="/wiki/Nuclear_flask" title="Nuclear flask">nuclear flasks</a> (usually to or from <a href="/wiki/Sellafield" title="Sellafield">Sellafield</a>, Cumbria). For security and safety reasons, trains carrying nuclear waste cannot be allowed to be left standing after a breakdown.</li> <li>In the days when most trains were locomotive-hauled, double heading was frequently used to return engines to their home depot, or to another point on the railway network, by attaching them to a scheduled train. "Light engine" movements, with no train attached, are avoided where possible as it is difficult to find space in the timetable for them. This is exacerbated by the fact that light engines must run at reduced speed because they do not benefit from the braking power or stabilising effect of a following train.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Disadvantages">Disadvantages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_heading&action=edit&section=2" title="Edit section: Disadvantages"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Double heading requires careful cooperation between the engine crews, and is a skilled technique, otherwise one locomotive's wheels could <a href="/wiki/Locomotive_wheelslip" title="Locomotive wheelslip">slip</a>, which could stall the train or even cause a <a href="/wiki/Derailment" title="Derailment">derailment</a>. </p><p>The risks of double heading as well as its costs (fuel and maintenance costs for the engines, wages for their crews) have led railroads to seek alternative solutions. <a href="/wiki/Railway_electrification_system" class="mw-redirect" title="Railway electrification system">Electrification</a> has been used in many cases. The <a href="/wiki/Milwaukee_Road" title="Milwaukee Road">Milwaukee Road</a> in the northern US was able to switch from triple-headed steam locomotives to a single electric locomotive. The costs of running extra steam locomotives were eliminated, and average train speeds increased because it was no longer necessary to attach and detach the locomotives. In Britain, the <a href="/wiki/Midland_Railway" title="Midland Railway">Midland Railway</a> used to use double-heading often, because it built only small, light <a href="/wiki/Locomotives" class="mw-redirect" title="Locomotives">locomotives</a>, which were often not powerful enough to haul the trains alone. Several accidents on the Midland system were indirectly caused by this 'small engine policy' and the resulting reliance on double-heading. Some were caused by trains stalling despite being double-headed, while others were caused by excessive light-engine movements as locomotives that had been used for double-heading returned to their depots (the <a href="/wiki/Hawes_Junction_rail_crash" title="Hawes Junction rail crash">Hawes Junction rail crash</a> in 1910). When the Midland was absorbed into the <a href="/wiki/London,_Midland_and_Scottish_Railway" title="London, Midland and Scottish Railway">London, Midland and Scottish Railway</a>, this practice was stopped because it was uneconomical, and more powerful locomotives were built. </p> <div class="mw-heading mw-heading2"><h2 id="Special_terminology">Special terminology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_heading&action=edit&section=3" title="Edit section: Special terminology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg/220px-Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg" decoding="async" width="220" height="160" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg/330px-Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1e/Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg/440px-Southern_Railway_Class_A1X_W11_and_W8_Wootton.jpg 2x" data-file-width="2430" data-file-height="1763" /></a><figcaption>Double heading <a href="/wiki/LB%26SCR_A1_class" title="LB&SCR A1 class">A1 and A1X 'Terriers</a>' Wooton and Freshwater running around the train at <a href="/wiki/Wootton_railway_station" title="Wootton railway station">Wootton railway station</a>, <a href="/wiki/Isle_of_Wight_Steam_Railway" title="Isle of Wight Steam Railway">Isle of Wight Steam Railway</a></figcaption></figure> <p>When a train formation includes two locomotives double-heading the service, they are commonly distinguished by the terms <i>pilot engine</i> for the leading locomotive, and <i><a href="/wiki/Train_engine" class="mw-redirect" title="Train engine">train engine</a></i> for the second locomotive. This should not be confused with the totally different procedure of adding a <a href="/wiki/Banking_engine" class="mw-redirect" title="Banking engine">banking engine</a> to the rear of a train to assist up a hill or away from a heavy start. </p> <div class="mw-heading mw-heading2"><h2 id="Configurations">Configurations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_heading&action=edit&section=4" title="Edit section: Configurations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>For many years the <a href="/wiki/Great_Western_Railway" title="Great Western Railway">Great Western Railway</a> (GWR) of the <a href="/wiki/United_Kingdom" title="United Kingdom">United Kingdom</a> often maintained a unique practice when double-heading was required, whereby if an extra locomotive was to be added to the front of a train for a particular section of line the second 'pilot' engine (called an 'assistant engine' in official GWR terminology) would be coupled "inside", or directly to the train, while the original 'train' engine would remain at the front of the formation (the reverse of normal practice). This was not universal practice on the GWR, with the company's regulations containing a complicated set of orders to determine whether an assistant engine should be placed inside or ahead of the train engine. These depended on the relative size and power of the two engines in question (larger assistant engines always went in front of the train engine), the <a href="/wiki/Wheel_arrangement" title="Wheel arrangement">wheel arrangement</a> of the two engines, whether the engines in question were <a href="/wiki/Tank_locomotive" title="Tank locomotive">tank locomotives</a> or not and whether the line being worked was a single upward gradient or contained any level sections or falling gradients. For instance, the GWR required that tank engines without <a href="/wiki/Bissel_truck" title="Bissel truck">leading bogies</a> should always be coupled inside (i.e. between the other locomotive and its train) of tender engines, regardless of which was the train engine and which was the assistant, while the company's <a href="/wiki/2-6-2" title="2-6-2">2-6-2</a> tank engines could lead. </p><p>The GWR implemented these unusual restrictions to avoid having smaller, lower-power engines (especially tank engines) without leading bogies being propelled from behind by faster, more powerful engines since this was determined to be a major factor in a fatal and especially destructive derailment at <a href="/wiki/Loughor" title="Loughor">Loughor</a> in October 1904. Putting the smaller assisting engine between the more powerful one and the train was deemed to provide better stability at speed and under power for the assisting engine. Despite requiring time-consuming shunting operations each time an engine had to be added to or removed from a train under these rules, they remained in place on parts of the GWR until <a href="/wiki/British_Rail" title="British Rail">nationalisation</a> in 1948. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Double_heading&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Push%E2%80%93pull_train" title="Push–pull train">Push–pull train</a></li></ul> <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=Double_heading&action=edit&section=6" 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"><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 class="citation book cs1"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=EY4jAAAAMAAJ"><i>Railway and Locomotive Engineering. A Practical Journal of Motive Power, Rolling Stock and Appliances. Volume 12</i></a>. New York: Angus Sinclair Company. 1899. p. 104.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Railway+and+Locomotive+Engineering.+A+Practical+Journal+of+Motive+Power%2C+Rolling+Stock+and+Appliances.+Volume+12&rft.place=New+York&rft.pages=104&rft.pub=Angus+Sinclair+Company&rft.date=1899&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DEY4jAAAAMAAJ&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADouble+heading" class="Z3988"></span></span> </li> </ol></div></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:Double-heading" class="extiw" title="commons:Category:Double-heading">Double-heading</a></span>.</div></div> </div> <!-- NewPP limit report Parsed by mw‐web.codfw.main‐66695f89d8‐kpjcg Cached time: 20241119175653 Cache expiry: 2592000 Reduced expiry: false Complications: [vary‐revision‐sha1, show‐toc] CPU time usage: 0.225 seconds Real time usage: 0.296 seconds Preprocessor visited node count: 369/1000000 Post‐expand include size: 13679/2097152 bytes Template argument size: 370/2097152 bytes Highest expansion depth: 14/100 Expensive parser function count: 2/500 Unstrip recursion depth: 1/20 Unstrip post‐expand size: 7680/5000000 bytes Lua time usage: 0.147/10.000 seconds Lua memory usage: 3339850/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 250.221 1 -total 43.29% 108.323 1 Template:Reflist 36.35% 90.946 1 Template:Cite_book 33.18% 83.030 1 Template:More_citations_needed 26.78% 67.019 1 Template:Ambox 22.73% 56.866 1 Template:Commons_category 22.02% 55.109 1 Template:Sister_project 21.35% 53.414 1 Template:Side_box 11.27% 28.208 2 Template:If_then_show 5.14% 12.856 1 Template:Find_sources_mainspace --> <!-- Saved in parser cache with key enwiki:pcache:30865007:|#|:idhash:canonical and timestamp 20241119175653 and revision id 1224430691. 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