Can I add a ZW to a TPC?

Store the ZW, Leave the TPC and brick in place, and program the TPC from your Legacy controller "TR-*", "M", "set" for conventional running with your Legacy handheld !

Or, Remove the Brick connect the ZW to the TPC, program the brick for Command, turn the TPC on and off with the handheld but vary the volltage conventionally with the ZW. There is more than one way to run 'em!

Thanks Jim,

I am using the TPC and brick like you mention to run the inside loop.  I want to run the outside loop also with another postwar loco.  I have the ZW nearby (using it for lights) so it's an easy add on.  I just didn't want to mess with my Legacy set up. 

Forgot to mention, I went to bricks for the quick breaker.  I stopped using the ZW's for Legacy & TMCC locos.

It sounds as if you would like to know if you can wire the Brick with TPC to the track and the ZW to the same track at the same time. I am not sure why you would want to do this but if this is really what you want to do you could use a DPDT toggle switch wired to select one power supply or the other. This would stop power from one from back feeding into the other.

Yes that's exactly what I would like to do.  I want to do it to run my old postwar locos with their original power supply while at the same time, have the ability to run my Legacy stuff (but) without adding any switches.  The smoke pellets seem to smell better with a ZW.

Would it hurt anything to do this?  

Just add ZW to the track but not turn on the brick or Legacy system.  I also wanted to run a couple TMCC locos in conventional mode (something I've never done since the Legacy base puts them in TMCC).  

Without adding A DPDT Switch to isolate the two I would advise against it. Back feeding power into the one unit or the other may lead to a potentially dangerous situation.

I don't understand why you would want to do that. The TPC allows you to run conventional using the brick. Then you dial the voltage up or down with the Cab2 remote.

There's no benefit to doing that, but there is some con's because the ZW doesn't have the protection that the brick or TPC has.

Guys, some of you missed he has a 2nd loop and only one TPC.

woojr, I would either do as Forest suggested with a switch or get the new Powermaster L for you're 2nd loop. As was stated, the back feed isn't good.