Headquartered in Missoula, Montana, the Rocky Mountain Division's main routes were from Livingston to Paradise, Montana via Helena, Montana and Mullan Pass, and from Logan, Montana, to Garrison, Montana, via Butte, Montana, and Homestake Pass. The division encompassed 892 route miles; 563 in main line and 330 in branches. It was home to the principal central district repair facility at Livingston, Montana.