need help with a wiring diagram to switch between tpc and throttle controls

You DO realize that with the TPC in Conventional mode the Cab-1 red dial acts just like a throttle to control track voltage, right?

 

George

What's powering your TPC?

I do know my TPC can control my conventional trains and that is how I run them now.  The issue is my 3 year old has a hard time with the cab 2 but has mastered using the transformer handle. When he wants to run his trains on daddy's layout I want him to be able to use the transformer handles.  

Right now I have a MRC transformer hooked up to the TPC.

A single pole double throw (SPDT) switch is all you need. 

 

Wiring to switch(all center rail leads only - all grounds/commons stay connected):  track feed to center terminal(was to TPC output), one side terminal to TPC output, the other to a junction with MRC output/TPC input(there is no need to disconnect this).

The Lionel BPC  (Block Power Controller) is designed for two power inputs, You can switch (4) blocks to either power source or turn them off.

 

That's a lot more complicated and expensive than a $2 SPDT switch.

I agree and like the toggle's manual simplicity Rob but I guess the BPC module advantages changeover from TPC to ZW via the handheld Cab 1[or 2]. 

 

I have a couple of BPCs stored somewhere from a dismantled layout. I used them to temporarily switch power[via Cab 1] to a single transformer source when my engine pickups were in separate districts upon crossing over the center rail gap between the two districts or tracks].

A remote option to switch over to hands on / manual control, then the BPC is the answer.

Rob

On my little simplistic "old folks" layout I changed all 17 of my Ross/Tortoise track switches from ASC modules and Cab 1 operation, over to manual on/on toggles. I can glance at the orientation of the toggle handle and instantly know the switch position...out or thru.[see hi-tech control panel].