Sensor 2 and Sensor 1 could be placed anywhere on a loop, or even back to back. The train will run from Sensor 1 to Sensor 2, when it passes sensor 2 the circuit will change the polarity of the tracks putting the train in reverse. The train will now travel in reverse until it passes over sensor 1, at which time the MR204 will again change the polarity of the track putting the Train into forward again. This will continue until power is removed from the system. By adding a toggle switch to the 0V line from the Auxiliary Power Source you can disable the MR204 so the polarity remains the same. Please note there is no slow down or slow start up facility in the MR204, so the train will have it's power Reversed at whatever speed you have set the Train Speed Controller. Connecting power to the rails can be done in a number of ways, most proprietary manufacturers have their own rail connectors, or you can solder wires directly to the underside of the tracks.
In this application the distance between Sensor 1 and Sensor 2 could be any length from 200mm to many metres, depending on the length of your train and the size of your layout. A magnet should be fitted to the front bogie of the Locomotive and the other fitted to the rear bogie of the last carriage using the glue dots or a spot of Super glue. Once you have soldered the wires to the sensors use a 20mm length of heat shrink on each joint to insulate the contacts from the rails. An ON / OFF toggle switch fitted to the 0v wire to the MR204 will disable the shuttle and the train will run normally.
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