For scenario (a), no signal route can be set remotely and it will be unsafe for trains to move over the turnout in question. For any trains in automatic train operation mode (ATO), supervised manual (SM) mode, or any one of the manual driving modes, trains will come to a stop in front of a Red signal.This type of failures will normally be related to a faulty detection relay inside the equipment room, a wayside switch rails detector failure, or a contactor failure inside the Points machine itself.