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Train retrorockets

No.1614062 View ViewReplyOriginalReport
Why wouldn't this work?
>Set a desirable stopping time/distance
>Computer feeds retrorocket units the train speed data in real time
>Set train weight
>Need to emergency stop
>10-motor retrorocket pods on every carriage fire the appropriate number of motors based on train speed, weight, and desirable stopping distance
>Stop the train on a dime
>Rockets are pointed forwards and slightly upwards to reduce the risk of derailment
>Pic related avoided
Other than initial cost, why isn't this a thing?