Some Idaho Info

Boise-Payette's last rail logging was on Mud Creek in Adams County which operated until 1947. This line was built during the war at a time when the company had already made the change over to truck logging. Soils on the aptly named creek were too unstable to support a truck road, so B-P used its last remaining rail equipment.*
Diamond Match Co.'s narrow-gauge Priest Lake line is interesting for its relatively late construction and extreme isolation. Blt 1927, operated to 1930 with two 18-ton Plymouth gas-mechanical locomotives. The decision to use internal combustion locomotives was driven by a concern for fire protection and, especially, by the light weight. Locomotives and rolling stock were moved in the winter; on sleds towed by Cat tractors from Priest River 35 miles north to Priest lake, then barged up the lake to Kalispell Bay. After abandonment of the Priest Lake line the equipment was standard-gauged and used on the company's Rapid Lightning Creek line until 1942. It is unclear whether this later line was a true logging road or simply a reload operation.**
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* James Witherell; "The Log Trains of Southern Idaho"
** John E. Lewis; "Reservation Narrow Gauge"