[lonewolf]

From what I'm hearing and what I know from working as a trainman in my youth is that this could have been avoided if the hand-brakes were applied .
Every rail car has hand brakes and when a train sits unattended at least 5 cars have to have the hand-brakes applied . If train sits on an incline even more brakes must be applied.
This was common practice at CP even if train is left running (which most are)