I think you missed simplest, and best (other than just using one system). No need for relays and automating, just a switch. I still don't like the inductor idea, at all. I think you've gone off base there, though it may work. DCC is more like DC than AC, the voltage changes quickly, then stays put for a while. Just make a bridge with three sections of track.
Section one: System one/Dead
Section Two: System one/System two
Section three: Dead/System Two
Drive onto the bridge, throw the switch, drive off the bridge. If you want to sense and automate, you can, but you are still going to have to have a throttle ready to control, so why not leave it manual anyway. I wouldn't introdure DC into the mix at all. It only adds unessessary confusion, to me.
Jeff
Section one: System one/Dead
Section Two: System one/System two
Section three: Dead/System Two
Drive onto the bridge, throw the switch, drive off the bridge. If you want to sense and automate, you can, but you are still going to have to have a throttle ready to control, so why not leave it manual anyway. I wouldn't introdure DC into the mix at all. It only adds unessessary confusion, to me.
Jeff