 Gilmore in 1910 was the center of a prosperous silver and lead mining district, and was thus a major source of early traffic for the railroad.When the G&P began service in 1910 the railroad owned a total of 8 steam locomotives, 16 passenger cars, 250 freight cars, a rotary snowplow, and other miscellaneous pieces of equipment; except for some of the freight cars, all equipment was acquired second-hand.When service began that May, the G&P scheduled a tri-weekly passenger train between Armstead and Salmon, leaving Armstead on Mondays, Wednesdays, and Fridays and returning on the following days.