The rear portion of a westbound BNSF unit oil train climbs the 2.2 percent grade of Mullan Pass out of Austin, Montana, on July 1, 2020. A manned helper set of a quartet of Montana Rail Link EMD SD70ACe locomotives (4304, 4311, 4313 and 4315) are cut in and shoving mid-train, while in the shadows in the background, a lone BNSF DPU unit pushes on the rear.
