My layout is small About 14'x14' square powered by a a MTH Z 4000 Transformer, Lionel Tubular track. My blocks have around 10 to 14 sections of track, to isolate them i used nylon pins ( a Break) in the hot center rail. I ran 14-2 Romex around the layout, one for the Track power, one for the 14 volt Accessory Power and one for the 10 Volt accessory power. Each of the romex is open ended meaning it's not a complete loop. Each isolated block has ONE feeder wire ( a Drop) to supply power soldered to the bottom of the Track, i did the hot and a ground for each block.. I used tap splice connectors with 16 gauge stranded wire to tap off of the Track power Romex. Basically the hot rail in each block is isolated from each other with one feeder wire per block. I plan on getting DCS in the near future, I think this will work. Since the layout is small I can run the entire layout off of one REV L TIU Channel since i have only 10 blocks. In my research I have found that up to 24 Blocks can be ran on one channel of a REV L Track interface Unit. Here is a thread that has an illustration that helped me understand it all.
i just use a toggle switch that is wired into the drop that powers my yard block to cut power if I want to.
