>>227372 (last bread)
I'm still thinking the train hit the trailer, separated it from the cab at the crossing, then dragged the trailer down the tracks until the trailer slid down the embankment.
In that case, then, if the truck was traveling right to left (in the wide angle photo) and tried to go around the cross blocks (zig zag), it would explain the angled hit, and the location of the wreckage.
Also, this is probably the resting position of the train right after the accident.
That's the back locomotive, so the train basically stopped within a train's length of the impact.
We should be able to get a ball park on the train's speed if we know the length of the train.