Yes the NHD resin cast roofs were done early 1990's the ones I purchased were for for Harriman arch roofs with the correct vents for some types of cars. The casting quality varied, some were slightly warped some not, they were cast in black, I used them to convert the Rivarossi coaches, a combine and baggage cars in my Con Cor Limited Edition Portland Rose train set to Harriman looking cars. New window material had to be fitted as the original was attached to the stock factory Rivarossi roof.I believe NHD also made a heavyweight pullman roof with air conditioning duct. Nate Goodman (Nato).Salt Lake, Utah.
