Constructed in 1909 and 1910 between the towns of Armstead, Montana and Salmon, Idaho, the G&P served mining and agricultural areas in Lemhi County, Idaho and Beaverhead County, Montana.
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Bannock Pass, on the Idaho-Montana border and the Continental Divide, was by far the most substantial obstacle encountered by the G&P.
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(The Oregon Short Line was a long-time subsidiary of the Union Pacific Railroad, and was later absorbed into that system.) Armstead was in a high valley of the Beaverhead River, in a region known for livestock grazing.
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