How a steam locomotive works, in 100 words ; Coal or oil is directed into the firebox (item 27 in the large diagram below), where it burns at high temperature. The firebox is surrounded by water in the boiler, and many tubes (28) extend from the firebox's front along the boiler barrel (29). Very hot gases travel through these tubes and up the smokestack/chimney (33).
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London Underground rolling stock includes the electric multiple units that run on the London Underground.The trains come in two sizes, smaller deep-tube trains and larger sub-surface trains that are of a similar size to those on British main lines. New trains are designed for the maximum number of standing passengers and for speed of access to the cars.
The rated evaporation capacity of the boiler is 10 tons per hour, the calorific value of natural gas is 35.438 MJ/Nm3, and the boiler efficiency is calculated at 95%. The gas consumption per hour of the 10 ton boiler: 7 MW*3600s/35.53 MJ/Nm3/95%=746
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