Question

Why do the doors of a corridor train open or shut, when the train starts or stop?​

Answer 1

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The doors of a train tend to continue in their state of rest because of inertia of rest when train starts or stops suddenly.Thus, the doors are shut backward with respect to the motion of train.

Answer 2

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when a train reaches the station, the passengers have to move out. new passengers have to depart in and for this purpose doors are made.

the doors of corridor train are actually connected to a circuit. whenever the train stops, the circuit connencts and train starts moving

when the train stops the circuit fuses and the train doors get shut.

hope this helps!