I looked up the Johns module. Little pricey. And adds up quick doing all my passenger cars. I may try the diode method in one car for a test. Do you have a number code for them?
Switches to buss line. Check.
My layout is 11.5" ceiling to base of wood. Wish my ladder had half steps. Be perfect for cleaning track, adding in new sections. Sucks to slouch over while working, adjusting, thinking...
Finished install of other side in the room. But ran out of cork 
... Still able to test run old engine around the closed loop with a few cars.
Now I can finally start working on the fencing around the whole thing.
