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You're right about the more recent part numbers, which begin with an R or a P (there may be a few other letters as well). That numbering system started in the 90's, or the red box era, after Rivarossi parted company with AHM and began selling under their own name. I don't know of any reference guide with a list of the newer numbers, just the exploded diagrams that came with the locos themselves. I have the parts lists for the Big Boy and Allegheny, but nothing else. The particular lead truck you're looking at is for the old-timer 4-4-0's, which were the Reno and the Inyo. Originally posted by NickelPlate759-October 15 2009: 6:13:06 PM