This Cross Track has been created using one of the most accurate 3D Printer available. Excellent fit compatibility with Lego train tracks! This track is not produced or sold by Lego. It is compatible with the Brand. It can be used at least with the following sets + more: - Passenger Train - Cargo Train - High Speed Passenger Train - Cargo Train Heavy Haul Train. Please note, these will not work with the 9V system. Note this is not an official LEGO product, is it compatible with Lego trains tracks. Please note, these will not work with the 9V system. Some slight variations on the finish will be visible, these are individually printed custom tracks, printed with precision.