We developed an optimized and even more flexible travel rail system for our new generation of painting robots. For interior painting, two travel rails are installed as a dual-rail system on top of each other on the booth wall. Traveling on the upper rail, for example, the handling robot, which opens the hood and the trunk lid, can “overtake” the painting robot on the lower rail. In this way, the paint booth can be shortened by one to two meters, which cuts investment, operating, and energy costs. Productivity is also increased thanks to reduced auxiliary process times. During exterior painting, the robot travels on a higher-mounted rail and can thus reach the surfaces of the car body better. Finally, narrower booths with correspondingly lower operating costs are also possible.