QUOTE: Originally posted by Chris F driver8, the #8352 is a GP-20 offered 1973-75, while the #8958 is a GP-20 dummy unit (no motor) offered in 1979 (#8957 is the powered version). The only external difference is the railings (older versions went into the cab, and could cause scraped paint when the cab was removed). jimhaleyscomet, I think the book to which John referred is Greenberg's Guide to Lionel Trains, 1970-1991, Volume 1, Motive Power and Rolling Stock. Unfortunately, it's out of print (Amazon is showing some used ones for sale). FWIW, MPC diesel P/N's tended to begin with "8", and the second number was the last number of the year of manufacture. That will get you within 10 years, anyway![:)]
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