Portland Terminal Railroad Company Alco S-4 diesel locomotive number 42, built in 1952, parked at Portland, Oregon, on September 1, 1970. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Portland Terminal Railroad Company Alco S-4 diesel locomotive number 41, built in 1952, at Portland, Oregon, circa 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Portland Terminal Railroad Company Alco S-2 diesel locomotive number 37, built in 1943, parked at Portland, Oregon, on May 30, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Portland Terminal Railroad Company Alco S-2 diesel locomotive number 36, built in 1943, parked at Portland, Oregon, on May 30, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Portland Terminal Railroad Company Alco S-1 diesel locomotive number 33. built in 1942, parked at Portland, Oregon, in 1975 or 1976. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Portland Railroad and Terminal SW1 100 at Portland Traction Company in 1959. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Portland Railroad and Terminal SW1 100 at Portland Traction Company in 1959. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Portland Railroad and Terminal Company SW1 200 with a transfer from Union Pacific Railroad's Albina Yard to Portland Traction's East Side Yard in 1978. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Port Townsend Railroad diesel locomotive number 11 switches grain cars at Tacoma, Washington, in August 1975, soon after the railroad ceased operation in Port Townsend. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , covered hopper car.

Port Townsend Railroad diesel locomotive number 11 switches grain cars at Tacoma, Washington, in August 1975, soon after the railroad ceased operation in Port Townsend. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , covered hopper car.