Per Barry, The most dedicated DCS guy there is:
A Single loop can have one power connection.
Optimally, you will break the center rail at the opposite point of the loop from the Power Drop. But even this is not absolutely required.
Proof? I did that on my 11' x 23' figure 8 layout and it worked fine except on the stub sidings. They were functional but didn't have 9 or 10 signal readings.
It now has 2 power drops at opposite ends simply because I was popping the circuit breaker with my Big Boy Smoking and pulling 53 cars when It got to the far end. A second power drop fixed that. And I still have no breaks in the center rail.
Admittedly, I've added more stub sidings and my signal sucks in a couple spots, but I can run the train right through that 3 foot spot and get control back as it crosses the switch after it.
Same Length to each drop?
Per Barry here on the forum several times, NOT AT ALL, Run wire pairs of Hot and common to each drop, whatever length is needed.
Per Barry, you don't need to break the outer rails at all, just the center rail.
Signal goes TIU to engine and Back on Center rail, Outer rail is just a common for it to reference against.
Besides, If you want TMCC or Legacy to work well, a continuous circuit on the outer rail is best.
