A robot that moves on rails can traverse large distances quickly and still reach its destination accurately, because it only needs to navigate a one-dimensional world. In this robot I used Lego train tracks from the RC Trains line, along with a train motor from the same line. The motor is a 9V motor that can be controlled by the NXT using a converter cable. The robot detects stations that have stands for a ball using the light sensor, but it was challenging to stop the robot precisely at the station.