In 1980 the trains theme received a major overhaul (although in some markets, the second generation system was not introduced until 1981). The builds were adapted to the minifigure, having appeared a few years earlier. The colour of the tracks was changed from blue to grey, and the 12-volt transformer changed to support utility functions in a more streamlined style with control switches that docked alongside the transformer, following the design style of increasingly streamlined model train controls of the time. The utility functions now included remotely controlled points, signals, wagon de-couplers and level crossings. The models gained a much more realistic appearance, including some with much longer carriage/wagon bodies and swivel bogies, and there were special windows which simulated having a pull-down glass section. The railcar bases were now again assembled from train-specific wheels and coupler and a greatly increased number of universal pieces. As with the previous generation, the electrical parts such as the train motor (7865) and the mains transformer unit (7864) were manufactured by Bühler on behalf of Lego. The transformer unit was also compatible with Technic motors.