2. Early implementations of Britain's TPWS on railways are exactly like this. Suppose you're pulling into a terminus station and, for whatever reason, you happen to stop such that your train's sensors are right on top of the TPWS "toast rack" (basically think radio transmitter). When the next driver turns the train on, it can see a TPWS transmission. Now, it knows perfectly well it isn't moving, so we're not in some terrifying near-death scenario, and it could let you, a human train driver, sort this out by, you know, not crashing the train into the station buffers. Nope, in v1.0 the firmware just considers starting in this situation to be a fatal error and won't let you move at all, the only authorised solution is to get rid of any passengers who've boarded your train, switch the train into it's (unsafe for passenger service) maintenance mode, drive it away from the beacons a few yards, stop, turn off the power, and then reboot the computer where it now can't see a troubling TPWS transmitter and now it's a working train again.
2. Early implementations of Britain's TPWS on railways are exactly like this. Suppose you're pulling into a terminus station and, for whatever reason, you happen to stop such that your train's sensors are right on top of the TPWS "toast rack" (basically think radio transmitter). When the next driver turns the train on, it can see a TPWS transmission. Now, it knows perfectly well it isn't moving, so we're not in some terrifying near-death scenario, and it could let you, a human train driver, sort this out by, you know, not crashing the train into the station buffers. Nope, in v1.0 the firmware just considers starting in this situation to be a fatal error and won't let you move at all, the only authorised solution is to get rid of any passengers who've boarded your train, switch the train into it's (unsafe for passenger service) maintenance mode, drive it away from the beacons a few yards, stop, turn off the power, and then reboot the computer where it now can't see a troubling TPWS transmitter and now it's a working train again.