Dear Train Steve,
I am sorry to say you are getting questionable advice from the forum. :cry: Collyn's reply to eliminate the loop defeats the purpose of the fun of turning the train around, and I believe both Tom and Harold are well intentioned but wrong.
Your diagram does present an interesting reverse loop problem, but I think you've only got one reversing section. As Tom broke it down, it LOOKS like two reversing loops, but his second picture would not complete a circuit without the entire layout.
I think you've got one reversing loop there, and I'd wire it like this;
View attachment 31495
First, consider the entire "top" of the sketch. That track, which I've gapped at 1 is nothing more that a long passing siding, and will not, by itself reverse the direction of the train.
Now, if it were my layout, I'd put my gaps at 1,2,3 and 4. 3 is kinda hard to see because the lines that represnt your turnouts are a little tight there. It doesn't really matter if the blue track is the "mainline A" and the red is the "reversing section B" or vice versa. Those are labels and nothing more.
The module C goes in where I've shown. Yellow wires don't show too well on a white background, so I used blue.
Regarding power to the track.... I have a medium size layout with a reversing loop and a reversing wye. They share the same module. If I remember, all my drops come from the same power bus, no problem. If fact, with DCC you do not need power blocks for the sake of having power blocks. I guess your reversing section are a sort of "power block" in that it's isolated.... but all track can ( and I believe should) get power from the same supply in the DCC world.
Best of luck and tell us the results of your experiments. I'd try it like my picture next. :thumb: