The thread is about the NYC subways but it seems to have been hijacked (Pelham 1-2-3?) so thanks RRR for putting it back on track. (pun intentional)
The system works fine because being that signals are automatic and linked to the block system and switch positions there is no operator to err except for the motorman in specific situations. One example is switching tracks in confined space is rather abrupt and cannot be accomplished at track speed so an approach (speed restriction) tells the motorman to slow the train. If ignored a derailment is likely, trains don't like to change direction abruptly and want to go straight.
The train protection system is only to prevent rear end collisions by stopping the train entering an occupied block indicated by a red signal. If the block ahead is clear but the one ahead of that is occupied an approach medium signal is given telling the motorman to slow down and prepare to stop.
Lastly, there is no guarantee the protection will not fail. I don't know of any rear end collisions since it was installed, if one did such a disaster would have made headlines. In the movies you've seen the most outlandish things including a giant worm eating a train but the REAL Men In Black don't herd space monsters or have talking worm friends addicted to coffee.
Unstoppable, nonsense but a whole lot of fun watching a train round an elevated curve on two wheels and even more fun watching the filming. Oh, did you get a chuckle out of AVR 777 in BNSF war bonnet livery?
The system works fine because being that signals are automatic and linked to the block system and switch positions there is no operator to err except for the motorman in specific situations. One example is switching tracks in confined space is rather abrupt and cannot be accomplished at track speed so an approach (speed restriction) tells the motorman to slow the train. If ignored a derailment is likely, trains don't like to change direction abruptly and want to go straight.
The train protection system is only to prevent rear end collisions by stopping the train entering an occupied block indicated by a red signal. If the block ahead is clear but the one ahead of that is occupied an approach medium signal is given telling the motorman to slow down and prepare to stop.
Lastly, there is no guarantee the protection will not fail. I don't know of any rear end collisions since it was installed, if one did such a disaster would have made headlines. In the movies you've seen the most outlandish things including a giant worm eating a train but the REAL Men In Black don't herd space monsters or have talking worm friends addicted to coffee.
Unstoppable, nonsense but a whole lot of fun watching a train round an elevated curve on two wheels and even more fun watching the filming. Oh, did you get a chuckle out of AVR 777 in BNSF war bonnet livery?
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