Logan was an important junction on the Northern Pacific's Rocky Mountain Division, where westbound trains could diverge north to the line to Helena, Montana and Mullan Pass, or south to Butte, Montana, via Homestake Pass. In addition, the Northern Pacific operated a secondary freight-only line between Logan and Bozeman, Montana from the 1920s through the 1950s. This was eventually made redundant by the use of diesel locomotives such as the EMD FT on the Northern Pacific and the alternate route was subsequently removed.