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steam brake
A steam brake is a type of brake for steam locomotives and their tenders, whereby a steam cylinder works directly on the brake linkages.
Steam brakes were primarily used on railways where vacuum brakes were used to brake the train, but where there was no vacuum brake on the steam locomotive itself, as for example in the United Kingdom, or where there was only a cable-operated brake (e.g. a Heberlein brake) running along the train, like for example in Saxony on the narrow gauge railways.
Steam brakes are usually found today on heritage steam locomotives.
== Operation ==
Steam is supplied to the steam brake cylinders from the locomotive boiler via a valve (the brake valve) which may have several fixed settings or be infinitely variable. The piston in the steam cylinder is set in motion by the steam admitted, the piston rod transfers the brake force via a system of rods to the brake blocks of the vehicle, thus achieving the braking effect. A return spring returns the piston to its rest position as soon as the steam supply is interrupted. The expanded and condensed steam is drained from the steam cylinder through a drain valve (''Entwässerungsventil'').
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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