Those look like TOFC. You'd be surprised if you started looking around, at how many of these new trailers are built. 

Many times the sidewalls of the trailer are thin and flimsy. They aren't load bearing, they just keep the load dry and

secure....(you cant see whats in there). Quite a few of them have a skeleton with tarp pulled tight between the frame.

Something like this happened down in pot yard years ago. The train hit a clearance detector and a passing train said 

to the trailertrain they had a trailer leaning. They were going to stop and they were instructed to keep going the Yard

Master would look it over when they came by. Well, they passed the YardMaster who (surprise) said nothing was wrong

and keep going don't tie up the railroad. Train goes up the road and the trailer leans over and hits an Amtrak train. No 

one got hurt, but the crew got fired. They told us as soon as a defector talks we should be ready to stop.

Pretty sure the crew got back, but don't remember any details.