A is a reverse loop where the track folds back onto itself. You can visualize the mismatched polarities where black connects to red and red connects to black. Since you are operating in DC, this will require a DPDT toggle switch to reverse polarities inside the loop while the train is inside the loop. Also, you will need to isolate the reverse loop from the rest of the layout by adding gaps.
B is a simple crossover between two tracks with matching polarities. Apparently, you have miswired the crossover. Assuming that you have added feeders to power the crossover, try flipping the two feeder wires.
Rich
Alton Junction
Thanks. I missed that on A. It also looks like B is feeding into the reverse. I do not have any bus connections in that area. The only connection are above the area. So I should isolate that connection also.
On the diagram, I've drawn lines where I think the isolators should be. Am I correct?
I'm using DC just to get the connections straight. I have a Digitrax Zephyr xtra that I will setup next.
Is best way to handle it to use a toggle switch or setup a power district with a booster & auto reverse module?
Appreciate the help.
Bob Pace
In section/switch B, if the switches have powered frogs and change polarity with the switch points, the two swtches cannot be connected to each other through the crossover. Using insulating joiners on the diverging routes of the switches will fix the problem.