This is a single reverse section controller. It can, however, be used to control multiple reverse sections as long as only one of the reverse sections is used at a time.

Hookup is very easy - 2 wires to track power, 2 wires to the reverse section. Of course, if your reverse section is more than about 3 feet long, you should have track feeders to each end of the reverse section. And if it's more than about 10 feet long, it should have track feeders about every 6 feet.

The AR1 can be adjusted for trip current. This allows it to be used with N scale as well as G scale.

The AR1 uses short circuit detection to know when the polarity needs to be switched. This means that the reverse section needs to be longer than the longest lighted passenger car, including lighted cabooses, or any other car with power pickup.

Since the AR1 draws track power for its operating current, it CANNOT be used within a detected block. To use it with a BDL168, for example, it must be placed upstream from one of the BDL168's zone of 8 blocks. This means that only the reverse section can be powered by that zone, and that reverse section cannot be part of another block (it must be a detected block all on its own).