I think they are AHC. Driven on one end by a swivel-mounted truck/motor combination with a lot of draw. My son was given two of these and both are nice-looking engines, but old. They don't look to have much use on them either. One is a Monon BL-2 and the other a SF Franklin-Morse. We run a DCC layout. What, if anything, can I do with these things...? Convert to a different chassis, motor, or use them for display only (least desireable option)...? Making them a dummy might be an outside possibility if i can talk him into it. Either I am getting dumber or 6-yr-olds are getting smarter.