Hello Everyone.  First off let me admit to the fact that I'm not very bright/knowledgeable about electrical circuitry.  I have set up a test bed to test run and exercise my HO, HOn30 and On30 engines.  I have a 6' board with Bachman HO and N scale EZ track.  My question is how to wire up the tracks to be powered ONE AT A TIME from either of two dedicated controllers, one a DC and the other a basic Bachman DCC.  I was thinking of using two DPDT on-off-on switches.

I have rolling stock mainly consisting of older tyco and some trainset quality life-like cars that I am using for my switching layout. They all not have body mounted Kadees and the question remains should I convert them to Metal Wheelsets? I have 18 cars being used on the "layout" and was curious what is the cheapest/most economic way to get enough for them all? I as many of you know have an extremely small budget so whatever help you can give would be appreciated! 

The house we have bought is rated at 50 amp service and is getting updated as soon as I get all the price quotes back to a 200 amp service. At the same time all of the wiring is being update along with the hardware.

It turns out that something called arc fault detection will be included into most rooms including the bedroom designated as the train room. I have no issues with safety. For those who don't know about this, if a spark is detected by the circuit the fuse is blown, shutting down everything on that circuit.