A system for painting an article, such as an automotive vehicle body, includes a painting booth, a conveyor for transporting articles through the painting booth, a first rail located beside and extending along the conveyor, a second rail located beside and extending along the conveyor at a lower elevation than an elevation of the first rail, a paint robot including an articulating arm mounted on the first rail for displacement along the first rail, a panel opener robot mounted on the second rail for displacement along the second rail such that the paint robot and the panel opener robot can move past each other on the rails without interference.