trains only can follow tracks. If the trackline they follow isn’t a circle, they need to go in two directions.
So they have two lokomotives.
Many end-stations of trains are a dead end, and to operate fast, hence leave again fast, a lokomotive needs to be at each end. Also, the Conductor needs to see where he is going.
it also depends on the terrain. if they need to go hill up and down, they need more power to push/pull and break.
some industrial trains also have two lokomotives because of the weight.
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