Answer Posted / thowsrf_emerosn

Electric Train Supply or ETS is the supply of electricity
which powers electrical equipment on a train. It is usually
provided by the locomotive, and used to power auxiliary
systems on the rolling stock, usually coaches.
Originally, trains hauled by a steam locomotive would be
provided with a supply of steam for heating the carriages.
When diesel locomotives replaced steam, the steam heating
was supplied by a boiler - either oil-fired, or heated by
an electric element in the case of diesel-electric
locomotives. At this time lighting was powered by batteries
which were charged by a dynamo when the train was in
motion, and buffet cars would use bottled gas for cooking
and water heating.

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