Many other functions can be
performed by steam pressure.
Steam can be transmitted through
the train to maintain temperature in passenger coaches. Steam heated vehicles
are recognisable by an additional flexible connecting hose by the couplings.
The steam is obtained from the boiler and is pressure reduced prior to
distribution down the train.
Steam generators are
generally mounted on top of the boiler and can produce electricity to power
lighting. They are quite simply small steam turbines.
To prevent the wheels
slipping on wet or greasy rails, sand can be released through a system of
tubes to dribble onto the rails. This can be by gravity alone, which requires
dry sand, or the sand can be deposited by steam.