No injuries is good news. I wish there was a little more detail. Such as why the bulldozer was close to, or on the tracks?
My guess is that it is a Bakken oilfield piece fo equipment on an oilfield access road/crossing. Perhaps the dozer operator thought he could beat Amtrak (which operates thru much of ND/MT at the allowable 79 MPH), or simply parked it too close to the tracks.
Actually I should not have said 'no injuries', as the engine crew were hospitalized. Oil field in origin was the only thing which came into mind. If it is farm related, while you can find a dozer in use, it would be less common equipment.
Fortunately it wasn't too serious. The idea of it being from an oil field sounds like that could be a possibility (because what else would you be using a bulldozer for out in the middle of an empty field?). I think that it might have just been too close to the tracks and the train struck the dozer.
