F40 wrote:Not sure about inside the stations, but if a train loses power en route (3rd rail shuts off), that will cause the train to trip.
Actually, no. If the 3rd rail (DC current) loses power the train will continue to roll with forward momentum until it comes to a stop or the T/O applies the brakes using whatever air is in the reservoir. This is very useful if a train is near a station when power is lost thus preventing it being stuck in the tunnel.
If the train trips it is because the nearest signals trip/stop arm is up which would happen if power (AC current) is lost to the signals as well. If signal power is still on then the train can continue to roll as described above.