Model: Both cars come with a built-in track cleaning device. Each one consists of a metal block that moves vertically with parallel polishing felt cleaning pads. The cleaning pads can be replaced and washed. Retractable opening roofs. Close couplers guide mechanism. Both cars permanently coupled. Length over buffers 15.3 cm/6-1/32". The gentle cleaning process is also suitable for nickel or brass rail. DC Wheel Set 70 05080.