here is a link to Georges tech tips on the Big Hauler ... http://www.girr.org/girr/tips/tips1/big_hauler_tips.html Read down a little ways and it explains how to Identify the different versions of chassis that were prodused.....as for the year of production, I will have to yield to Loco Bill and his vast knowledge, or that of someone else. hope this is some help....Later all....S.B.