With the GAC3 adapter module, plastic rails from other manufacturers can be connected to the Harrel-RS system. Prerequisite is a scale of 1:24 and a track spacing of 100mm. Four exposed copper strands allow the connection to two H-RS Powerslots and thus the power supply. The plastic rail lies on the MDF which is rounded at the ends. This also makes it possible to combine it with curves. The module corresponds to the size of the Straight 3.