Live close to railroad tracks constantly see cars being pulled with one engine forward and one backward. The one that really stumped me yesterday, was a train that started with 5 engines in the following orientation: forward, backward, forward, forward, backward
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Simply put, the locomotives at both ends are so the train can be operated from both ends without having to physically move the locomotive from one end to the other in order to drive it backwards. Increasing the amount of locomotives increases the available power capacity, meaning longer and heavier trains.
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