All trains have what is sometimes known as a "dead man's switch". This would automatically slow the train down to a stop, provided the driver either stopped tapping a certain button within a set time frame, or released their grip on a trigger type mechanism whilst operating the vehicle. The shots fired at the train driver's cab obviously cause the emergency brake to fail, but the scene can then be inferred aa justifying why the "dead man's switch" system failed to deactivate the slow down and stopping procedure.

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