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Could I ask who's calling? <a href=" http://www.bouchonferbordeaux.com/index.php/mail-order-prescription-drugs-united-healthcare#lend ">is buying prescription drugs online illegal</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.