This actually explains a lot.
As the truck goes around the barrier, it would have to cab angled toward the oncoming train.
This explains the dmg as well as the cab being ripped from the trailer.
Additionally, if you llok at tue trailer, you can see the one of the connecting arms it stretched out. Think about one of those bendy straws.
Not saying it wasnt deliberate. In fact, the driver would have seen it coming.