Jay Ross says:

I still use blocks, and block on/off switches. Several reasons. I run DCC & DC on my layout, but being able to turn blocks on and off makes it easier to isolate problems like short circuits. Also I like having block “Occupied” indicators, and you must have isolated blocks to do so. When I park trains anywhere on the layout, I can switch them off to conserve power for other sections. I run a power buss with heavy gauge wire, around the layout, where each block is tapped into the buss. I use Atlas Selector switches to control the blocks because they are simple and easy to use. This may not be the preferred method, but it works for me. and it still allows me to run DC if I want too.