Thunder at Iron Ridge A westbound BNSF coal train thunders through Iron Ridge cut between Austin and Weed, Montana, climbing Mullan Pass on the afternoon of July 6, 2022. The train is negotiating a large horseshoe curve, and the mid-train Montana Rail Link helper set of four EMD SD70ACes can be seen down below in the background, as well as the lone BNSF DPU unit on the rear of the train on the far right.