Control Box. This control box is for dividing a track or accessory circuit into 4 different circuits, each with two connections. For example, 4 storage sidings in the same track circuit or 4 users in the same accessory circuit can be turned on and off. The control box comes with 8 sockets on the back and a plug on one end and a socket on the other end. 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 7274 control box.