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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Train engines work just as well forward as backwards. Cars are difficult to steer backwards due it the adjustable wheels being at the front and the seats facing that way, but trains just follow the tracks and only the front one needs someone looking forward. They control all the power.
Cars have slower reverse gears because you don’t drive at high speed backwards. Trains don’t have that kind of gearing.
Trains are also very hard to turn around. You might as well just hook them up facing whatever direction they are already oriented in.
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