ClipArt ETC
"An implement for clearing away snow from roads, railways, etc. a, body of plow; b, caboose for implements and workmen; c, movable wings for widening the cuttings; c1, doors which give access to leading truck for oiling, etc.; d, cupola; e, headlight; f, iron plates, scrapers, or shoes which remove snow from the outer margins of the track; f, adjustable aprons which clean out the snow from between the tracks flush with the wheel flanges; g, intermediate apron; h, draw-bar for hauling the plow when not in use; i, adjustable scraper for removing hard-packed snow or ice from the inner side of the rails." —Whitney, 1889

Wing Snow Plow

"An implement for clearing away snow from roads, railways, etc. a, body of plow; b, caboose for implements…