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@sacredhart
Train doors, the following isn't universal I'm sure but in my experience:
Some train doors are have no sensors so will shut trapping whatever on it. This should prevent the train from moving as it breaks the train interlock leaving the brakes on.
There will be a emergency door release next to the door. Pulling the door release will allow you to manually pull the doors apart. This may only work below a certain speed if the train is in motion. (5mph in my experience).
There will be a passenger Comms button to talk to the driver in an emergency.
Activating either door release or passenger Comms should trigger a warning for the driver in the cab which would prevent the train departing until investigated.