The bus was very intact? It looks like the entire right side was opened up like a tin can? I wouldn't call that very intact! It could have been worse, but it was bad enough as is.
I have seen hundreds of vehicle crashes for being hit by a train it was very intact.
I have seen semi trucks hit by trains and the biggest piece to pick up was the engine of the truck and that was a mile or so down the track from the collision site.