The Mountain Subdivision's summit is at Altamont, Maryland, at the west end of the Seventeen Mile Grade; the grade's east end is at Piedmont, West Virginia.
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The cutoff line ran from McKenzie, Maryland to Patterson Creek, West Virginia, providing a bypass of the yard for coal trains moving between Keyser and Brunswick, Maryland.
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MD 135 heads straight southeast toward a grade-separated crossing of CSX's Mountain Subdivision very close to the railroad's crossing of the Eastern Continental Divide.