[something765478]

> If a train exceeds its permitted speed for any reason, the system intervenes immediately.

Does the system automatically slow down the train, or does it notify the engineer? I would imagine that there are some scenarios where going over the speed limit is the correct choice.

[m4rtink]

ATC stops the train - this is actually an important plot point in both "shinaksen explosion" movies:

https://en.wikipedia.org/wiki/The_Bullet_Train

https://en.wikipedia.org/wiki/Bullet_Train_Explosion

In the movies terrorists place a bomb on board and the train crew has to maintain a minimum speed or the bomb explodes (this is where that american movie with a bus got the idea). And they have to manipulate the ATC or else it will stop the train when they enter sections of the track with lower minimum speed, or else ATC stops the train and the bomb explodes.

[lolc]

I'm curious what scenarios your imagining. Because I can't think of a single situation where a track limit should not be applied automatically, at least to trains with passengers on them.

[something765478]

I realize that this may not be an appropriate comparison, but I was thinking of cars; there are absolutely scenarios in which driving faster than the speed limit is the correct decision (i.e. trying to get someone to a hospital).