Thanks for the photos, I have seen them as well. The siding does not show on any Valuation Survey map or the abandonment track diagram you see in many of the books on the Marshall Pass line. Still a mystery more pictures did not appear. Toward the end the tank east of Marshall Pass was about a mile downgrade in the trees at about mp 239.5 (Parlin Curve). The date for securing water rights was 1932. My detail valuation map of Marshall Pass shows the siding was erased from the final copy.
Bob Meckley
Glen NH