Built circa 1941 by Weyerhaeuser employees at the Klamath Falls, Oregon, shops, this snow dozier was one of three constructed on a secondhand 40 foot flatcar following a Great Northern Railway design. Weyerhaeuser logging railroads operated year-round, and this dozier saw service on Illy Mountain east of Sprague River, Oregon. Its wings and nose plows were operated by compressed air through a system of cylinders, pulleys, and cables, with the compressed air supplied by a following locomotive. At least two employees were required to operate it, one on each side of the cab in front of the dozier, where they had a clear view of the track ahead and could handle the wings and nose plow in the safest manner. Before radios, whistle signals were used to communicate with the locomotive engineer pushing the dozier: one blast to stop, two blasts to go forward, and three blasts to back up.