Steam locomotive in sidings. 1940s steam locomotive being supplied with coal from sidings next to a water tower. Steam locomotives burn coal to boil water to produce steam to drive their engine. The coal is added to the locomotive's bunker using the conveyor belt at right. This locomotive is from the Hunslet Austerity 0-6-0ST class, and has been preserved and maintained by the Scottish Railway Preservation Society at Borrowstounness in Scotland. It was built by the W. G. Bagnall engineering company in 1945, and used by the UK War Department (hence the WD lettering), with the number 75254.