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Canadian National Railways built thirteen single ended, wingless snowplows at their Transcona Shops in the 1938. They were numbered i55600-55612. In 1954, a new plow, of all- welded construction, was built to the same plan at Moncton, numbered 55613.
This HO scale part provides the cupola for these plows. No rivet detail has been included- there will be some texture on the part from printing, and it's far easier to sand and prime first, then add rivet detail using surface detail decals from either Archer or MicroMark. Of course, if you choose to model #55613, no rivets are needed.
You will need to buy the body (available at my shop on Shapeways: