UD Twin Track Panel Mounted ControllerDouble track controller designed to sit inside a control panel. This controller has two rotating dials to control the speed of two seperate locomotives and a DPDT switch on each circuit to control the direction of travel, you can also switch it to the centre position to cut off the power to the track. The following power supplys can be used to power this unit. GAU M1 Cased Transformer GAU T1 Open Transformer GAU WM1 Wall Mounted Transformer TECHNICAL