TTSV1 Servo Controller For DC/DCC Systems(Level crossing and servo not included) The Servo Controller connects directly to most low power analogue radio control type servos. Servos are versatile low cost control actuators which are ideal for animating layouts. SV1 makes it easy to control a servo in a number of ways: Train passing a Track Sensor moves the servo to defined positions Mimic switch moves the servo to defined positions DCC Controller in loco mode controls servo using the speed