Is it meant to work like that?

[fygjam]

The NTSB has released its preliminary report into the East Palestine, Ohio, train derailment. Apparently

Track side fault detection equipment detected a hot bearing on one of the cars.

The driver was notified.

The driver applied the dynamic (gentle) braking system in order to stop and inspect.

The hot bearing reached a sufficiently high temperature to rupture the pneumatic brake line where air pressure holds the brakes OFF.

The loss of air pressure caused the emergency brakes to be applied.

This caused a number of cars to concertina and leave the tracks.

So the safety system caused the derailment?

 

[Lantern]

Tragic if true.