Suppose the emergency brake button in the cab of a train is not working. Would the emergency brake cords / buttons in the passenger cars still work?
In that particular scene, a R46 City Subway Car was rendered "unstoppable" by ripping out the speed control lever in the car, which also happened to disable the emergency brake button (see 16 seconds into the video).
With movies, we suspend our disbelief in order to enjoy the story that is presented. But the above SciFi question got me to thinking about how emergency brake systems are designed for trains.
Given trains significant mass and momentum when moving, it seems like there would be multiple, redundant safety systems to provide braking capability for the train.
Is there a common safety design used for the braking system of trains?
Does that design account for portions of the system failing and allowing other portions to compensate for the failed components? (ie. would the passenger car emergency brakes still work?)