Steam locomotive
41 018 of the Deutsche Reichsbahn climbing the famous Schiefe Ebene in Germany, 2016. The 4-8-8-4 Union Pacific Big Boys were among the largest steam locomotives ever built The LNER Class A4 4468 Mallard is the current confirmed record holder as the fastest steam locomotive at 203 km/h (126 mph) on 3 July 1938. A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine. These locomotives are fueled by burning combustible material – usually coal, wood, or oil – to produce steam in a boiler. The steam moves reciprocating pistons which are mechanically connected to the locomotive's main wheels (drivers). Both fuel and water supplies are carried with the locomotive, either on the locomotive itself or in wagons (tenders) pulled behind. Steam locomotives were first developed in Great Britain during the early 19th century and used for railway transport until the middle of the 20th century. The first steam locomotive, made by Richard Trevith...