2 new models, a large motorcycle and a bulldozer, as well as 6 small boxed supplementary sets and a 12 V stationary motor were released. The 12V motor, released only in Europe, was powered by the 741 transformer originally designed for the 12V Lego trains.

New elements in 1979 included the now common connector peg with axle, tread links, and the 12 V motor. The tread links were essentially a modified chain link and have appeared in only a handful of sets.

1979 US ad: 125K