Shay locomotives provided the power on this mountainous spur line.
The Shay locomotives had to be disassembled and hauled by wagon up the mountain, since the railroad operated in the high country but did not connect to other railroads in the lowlands.
The Yosemite Mountain Sugar Pine Railroad owns and operates two former West Side Lumber Company Shays, Nos. 10 and 15, on its line just south of Yosemite National Park.
The old Shay logging train grades have been replaced with paved roads and underground utilities, giving it a pleasant rural atmosphere.
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