<sod>In connection with the construction of the [[Jubilee Line Extension]] project, fourteen diesel-hydraulic locomotives were purchased from [[Schöma]] of Germany to assist in equipping the tunnels prior to electrification. Weighing 33.88 tonnes each, they are {{convert|28|ft|m}} long, and are powered by {{convert|500|hp|kW|adj=on}} six-cylinder inline diesel engines, which give them a maximum speed of {{convert|31|mph|km/h|abbr=on}}. They entered service from February 1996,<ref>{{cite web |url=http://www.tfl.gov.uk/assets/downloads/foi/Rolling_stock_Data_Sheet_2nd_Edition.pdf |title=Rolling Stock Data Sheet 2nd Edition |publisher=Transport for London |page=22 |accessdate=2011-04-16}}</ref> are built to tube tunnel loading gauge, and were fitted with  [[Railway coupling#Janney coupler|buckeye]] couplers when built.<ref name=hardy56>{{harvnb |Hardy |2002 |p=56}}</ref> They are equipped with exhaust scrubbers to prevent soot and other particles from being expelled into the tunnels. The locomotives have since been used on other engineering projects. When not in use they can be found at [[Lillie Bridge depot]] or [[Ruislip depot]].<eod>
<sod>In connection with the construction of the [[Jubilee Line Extension]] project, fourteen diesel-hydraulic locomotives were purchased from [[Schöma]] of Germany to assist in equipping the tunnels prior to electrification. Weighing 33.88 tonnes each, they are {{convert|28|ft|m}} long, and are powered by {{convert|500|hp|kW|adj=on}} six-cylinder inline diesel engines, which give them a maximum speed of {{convert|31|mph|km/h|abbr=on}}. They entered service from February 1996,<ref>{{cite web |url=http://www.tfl.gov.uk/assets/downloads/foi/Rolling_stock_Data_Sheet_2nd_Edition.pdf |title=Rolling Stock Data Sheet 2nd Edition |publisher=Transport for London |page=22 |accessdate=2011-04-16}}</ref> are built to tube tunnel loading gauge, and were fitted with  [[Railway coupling#Janney coupler|buckeye]] couplers when built.<ref name=hardy56>{{harvnb |Hardy |2002 |p=56}}</ref> They are equipped with exhaust scrubbers to prevent soot and other particles from being expelled into the tunnels. The locomotives have since been used on other engineering projects. When not in use they can be found at [[Lillie Bridge Depot]] or [[Ruislip depot]].<eod>