Marklin 7274 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. This version makes use of the older style plugs.