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Canadian National Railways built four double ended snowplows at their Transcona Shops in 1939, # 55696-55699. These plows were intended for use on branchlines where minimal turning facilities existed, and where the line would be in danger of drifting in before the plow train could get back to its home terminal.
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.
You will need to buy the body (available at my shop on Shapeways: