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There are a couple of reasons to have working engine at both ends of a train or part way down a train.
The knuckles on a railroad car are designed to allow a certain amount of movement between the two cars. in certain cases where there is lots of grade variation or high curvature in the track it can cause this slack to act like a whip and and in extreme cases cause the cars to derail. If the engine is at the rear of the train the main purpose is to control the slack in between the cars of the train.
If the engine is part way down the train it limits the amount of slack in the train and helps the cars track around curves better so there is less rail wear. If engines are actually operating on both ends, the rears are pushers. They are typically used to push a heavy train over a hill that it would not be able to pull on its own. If the enigines are not operating they are just being transported to another locaction.
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what is it called when the governor general ends both sides of parliament
What is it called when the governor general ends both houses of parliament?
what is it called when the governor general ends both sides of parliament
