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I'm a housewife <a href=" http://weimar.edu/where-can-i-buy-college-essays/#studio ">where can i buy a research paper</a> Alton Bob- you are correct. Air is used to RELEASE the brakes on a train, not to engage them. Thus, a locomotive shutting down would have ensure that the train could not move. Compressed air would have had to have been pumped into the train-line to release the brakes and the only way that I know for that to happen is for someone to open the brake valve.