The true high point of the 12 V trains was the modular electric system. Lego produced electric crossovers, signals, lights (both street lights and train lights), level crossings and uncouplers, all of which could be daisy-chained to an auxillary output on the transformer. It was as close as Lego ever got to a true model railroad. As before these sets were only available in Europe which makes them increasingly hard to find......