Don't cut any rails on the #175!!! Don't mess with it all, just yet.
Why are the powermasters in the mix? Why the second brick?
Try changing your transformer configuration to one 135 Brick to lock-on to Fixed 1 IN. (I assume, the railroad building looking lock-on)
Now connect all of your track feeds to Fixed 1 OUT.
That should provide 18 volts AC max to the all of the track at 7amps.
If you need more power due to multiple engines and lighted cars, then you need a 180 brick.
Also, get a digital multi-meter if you don't have one. Harbor freight has them cheap. You can't play with electric trains without one. It helps a lot when troubleshooting. AC volts ~ setting with power on, OHMS Ω with power off.