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If the Commons of all transformers are phased and connected together and also connected to the outer rails of all four loops, the Legacy Base U post can then be connected anywhere to this Common bus at any point and is thereby connected to all 4 loops.

In other words, as long as the all the Commons are connected together somewhere (including one from the Legacy Base) and to the four track loops, additional wires from the Legacy base are unnecessary.

Last edited by SteveH
@Kevin1 posted:

I have 3 separate transformers, Z4000 and and 2 CW80's  with 4 separate loops of track and only had one wire from legacy base going to one of the tracks. I am able to control all legacy/TMCC engines on any of the tracks. My transformers are not connected or phased together.

Just to expand on what Steve said, the Legacy signal can be robust.  Since part of the signal is using the house ground wiring, you can have loops not physically connected to the base but still receiving the "over the air" signal.  As Steve said it's not always reliable.

The answer is that it depends.

If your 4 loops are electrically connected to each other, then the Legacy wire only has to be connected to one of the loops and the Legacy signal will permeate through all 4 loops.

If the 4 loops are electrically separate then, for reliable operation, you should connect the Legacy wire to each loop. You can do this in a variety of ways, including using a terminal block. 

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