Control Box. This control box is for turning 4 different track or accessory circuits on and off. For example, power can be controlled in 4 storage sidings in 4 different track circuits. Unit comes with 8 sockets on the back. All of the connections are for the new plugs from the 71400 sets. 8 appropriate plugs included. Dimensions 80 x 40 mm / 3-1/8" x 1-9/16". Highlights: All of the connections on this control box have the new plugs and sockets. Plugs to work with this control box are included. This control box works in the same manner as the 7273 control box.