Individual driving with the Digital Rail Extension Kit A little novelty from time to time! Even if we love to ride again and again on the circuit that we love so much, we still end up feeling the need to change a little. And that's exactly what this digital rail extension kit is for. With four standard straight lines a switch to the left, a double switch of the track section locks and a lane change curve new track elements can be installed on the Carrera DIGITAL 124 and Carrera DIGITAL 132 circuits. The tracks are 1:24 scale and are ideal for the two race circuits mentioned above. The switches allow for fast lane changes and give you the opportunity to overtake the opponent's car imaginatively especially during chases. Meanwhile, the straight lines allow for even more fun while extending the road.Info: this digital expansion kit can be used for upgrading.