1 x model railroad automatic signal controller with train detector master board

Price is for 1 master board signal controller        Functions:what can this Master board do?control the block signal by the train automatically: it may control 2 aspects signal, 3 aspects signal or 4 aspects signal.use it with a slave board ( sell separately ), they may stop and restart the train before the rail spur.use it with a slave board ( sell separately ), they may stop and restart trains at the station; or use them as shuttle train controller.use it with the crossing signal sound board ( sell separately ) and the flasher board ( sell separately ), trigger them automatically by trains.turn on lights, point motors, tunnel lighting or othe...