Northern Pacific Railroad rotary snow plow number 10 parked at Auburn, Washington in May 1968. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, maintenance of way

Northern Pacific Railroad rotary snowplow at Easton, Washington, circa 1950. A Northern Pacific rotary snowplow clears the Easton yard near the covered turntable and cinder pit. Photo by Albert Farrow, J.M. Fredrickson Collection. Other Subject Classes: rotary snow plow, maintenance of way.

Northern Pacific Railroad rotary snow plow number 10 clearing the westbound mainline at Martin, Washington in February 1945. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, steam locomotive, maintenance of way

Northern Pacific Railroad rotary snow plow number 10 clearing the westbound mainline at Martin, Washington in February 1945. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, maintenance of way

Northern Pacific Railroad rotary snow plow number 10 clearing the westbound mainline at Martin, Washington in February, 1945. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, steam locomotive, maintenance of way

Northern Pacific Railroad rotary snow plow number 10 stopped after a run at Upham, Washington, on January 25, 1943. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, steam locomotive maintenance of way

Northern Pacific Railroad rotary snow plow number 42 clearing the westbound mainline at Martin, Washington in 1949-50. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, steam locomotive, maintenance of way

Northern Pacific Railroad rotary snow plow number 42 and crew at Martin, Washington in 1949-50. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, maintenance of way, railroad crew

Northern Pacific Railroad rotary snow plow number 42 clearing the westbound mainline at Martin, Washington in February, 1945. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, maintenance of way

Northern Pacific Railroad rotary snow plow, number 42 clearing the westbound mainline at Martin, Washington in February, 1945. Photo by J.M. Fredrickson. Other Subject Classes: rotary snow plow, maintenance of way