The Turnout Module is used in conjunction with the ISS Signal Controllers, SCA-2ä, SCA-3ä, SCA-4ä, SCA-5ä, whenever it becomes necessary to signal a siding or a diverging route. The board uses the latest in surface mount technology and has screw terminal connectors. It is in effect an 4 pole double throw electronic switch, which replaces a mechanical relay at less cost, easier installation and is maintenance free. On board there are 3 LED’s used to indicate which side of the module is switched and if the “D” input to the board is activated indicating the block is occupied.