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Modern railroad cars are designed to never "runaway". But nothing is totally redundant. So I'll redirect this question: What would you do If you lost your brakes? I think you would find quite a few similarities with yourself and a train engineer. Modern trains can and do runaway. The San Bernardino Train Disaster of 1989 is a case in point. Human error was the cause. The Runaway train could not be stopped, and crashed into a neighborhood, killing many people and the crew. Though the train could not be stopped by railroad personnel, despite "modern design," given time it could have been stopped, say, by demolition of the track with explosives. This runaway train could have been stopped had the proper number of locomotives with the proper amount of braking power been employed for the weight of the load involved. The emergency braking system was simply insufficient to stop weight and downhill momentum. The car analogy doesn't apply very well, because in a car you have the option of reducing your speed, even in a brake failure, by steering into an uphill direction, or even sideswiping stationary objects. We've all seen runaway truck pull-off lanes on long grades, places where the truck can steer off the road onto an uphill slope with a high-friction surface, in case of brake failure. Trains can't do this.

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