It was a level crossing with adequate warning, according to the train people. Also, they say he was on the phone at the time, and his wife said he was depressed. My memory is a little hazy on this, but I think I remember reading something where she made some allegations that might back up the suicide theory. My apologies if I am not remembering correctly. Of course, the train people are advocating in their own self interest, but Matt has a spotty track record. Also, I haven't listened to the cast, but I do hope you answered the real question here - who go the tractor, him or his brother? I do hope Matt is ok, and I hope he learned some valuable lessons about life.
Edit:
Here is a pic of the train crossing. It would be hard to miss a train here. Also,
here is an article where the train company's argument is listed.