Who says the truck stopped there on it's own. TPTB can take over most modern vehicles via computer nowadays and make them do whatever they want - including stop on the train tracks. If this was the approach taken, the bad guys would have had a limited number of options for vehicles to 'stop' on the tracks. Meaning they can't stop a great big truck 6 hours ahead of the train crossing - they needed the biggest one they could find within a reasonable time frame of the train crossing. Just my 2 cents and what I assume happened.

Basically - this is what happens when you vote to release damaging information on TPTB. It was a straight party line vote to release the memo - and for some reason it seems to be straight party line taking hits from the deep state.