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My understanding from what little I've read about the bakes is that when the train is in automatic mode, driven by the computer, you apply the brakes by hitting the panic button. The brakes then go on with full force and don't come off. It's an all or nothing emergency brake.
Gradual braking can only be done if the train is in manual mode and the driver is actually driving.
During the crash, this train was in automatic mode.
There's something strange going on if the skid marks stop and then continue again.
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