It is clearly in the interest of the railroad to not bear responsibility for this event. So rather than it being a case of something simple - like the engineer neglecting to properly secure his train - they need to find some other outside factor.
Exactly. It may well be that the train was tampered with, but I’m sure as h*ll not going to believe it just because the chairman of the railroad says it is so.
Perhaps there was some foul play involved, and if there was, that needs to be examined along with security policies and tie down procedures.