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[quote user="Greg Elmassian"]I'd recommend isolating the blocks completely. That way, you could use the same power supply for all 3 blocks, and have one block reversed. If you use common rail, then you have to reverse everything at the same time.......................................................... [/quote] A note from our techie - who has used the common rail method on many layouts (both customers' and our own) since 1976: Common rail is usually used with at least two independent throttles. Independent means each throttle has its own power supply fed from the 110V (or 220V in Europe) circuit. Each block can be switched to either A or B cab. The KISS principle applies as follows, the blocks only have one feeder wire. In the example that means: 1 wire to the one loop, 1 wire to the second loop, 1 wire to the yard. 1 additional wire to the common rail. Since the throttles are both tied to the common rail and the feeder references to the common it doesn't matter which polarity/direction each of the blocks is switched to. It only matters when you transfer from one block to the other, then the polarity needs to be correct. Makes trouble shooting as easy as 1-2-3, reduces the cost, reduces the work (fewer wires to run). If  Andrew (red_dog_six) would like a schematic for the circuit, please let us know (Free of charge from a Canadian supplier) Regards ER
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