Jim, I wish they were hydrostatic!! has a cone clutch assembly on each side then disc brake to a chain drive.In the owners manual it states that if used a lot to lock the clutches open to cool or they could stick because of the tapered drum. I wouldn't mind coming across another set of tracks some day. The engine is a 602 c.c. citroen engine ,like from the Citroen from the original "pink panther" movie UGLY little vehicle but expensive to buy nowdays. devoleped 35 h.p. at around 5,000 rpm. supposedly the factory made around 400 of these from 1979 thru 1986. i have this one and 2 other incomplete machines. Don