A loaded grain train of 112 cars with three locomotives - one on the head-end, one mid-train, and one at the rear - had been stopped and was in "emergency" on the steep mountain grade. Incredulously, there was no regulation nor railroad rule to mandate the use of handbrakes. The train sat for 2 hours. The doomed "relief crew" arrived by van to take charge of the train, relieving the crew. Upon boarding the lead locomotive, the train began to roll, the air brakes having "bled off" while standing in the sub-zero temperatures.