Spdt toggle and l.e.d

What does the switch toggle...AC input to the transformers...the output of the transformers...?

The switch is configured as follows:    The center lug of switch goes to the center rail of track.   The left and right lugs of switch go to the positive side of respective transformers.   

I would suggest that you use a toggle switch with the appropriate number of poles (2) to do the job.

One pole to do the track power switching, and the second pole to switch the LED's.

You need a DPDT toggle switch.

Thanks that's what I was thinking but needed confirmation

Another option.  You probably have an unused DC output wall adapter from a cellphone charger or the like.  Connect the DC output to the Legacy transformer output.  Place the LED (and resistor) on the track center after the switch.  Then, when the SPDT directs the Legacy voltage onto track center, the DC voltage completes the circuit to the LED. 

The idea is the DC adapter voltage is electrically isolated from the two Z4000 AC voltages so you can use a single "pole" to switch both the AC track voltage and the DC LED voltage.

Stan, I'd like to see a drawing of your idea.  I am having a hard time visualizing how you keep the AC traction power and the DC led power isolated.

Also, what do you mean by "Connect the DC output to the Legacy transformer output." ?

Arthur, it was a half-baked idea.  DPDT is correct solution.

The idea was to add a signal to Legacy power (but not to Conventional power ) that could be detected by the LED on the other side of the switch.  To your point, a simple DC signal would not provide enough isolation or ability to be differentiated since and LED at 60 Hz looks solid.  A high frequency tone would pass the switch but be blocked by the AC power return path with a corresponding detector at the LED - hopelessly complex.

Thanks guys,   I kinda figured the dpdt would be the solution, but since I have more than ten spdt already wired I thought I would throw this against the wall and think out of the box.     Back to the ALL Electroncs catalog,   dpdt here i come

thanks 

Stan, I'm shocked!  I think this is the first time I've seen you come up with a less than 100% thought through solution, are you getting old?

Yup. Eyesight, memory, etc.

I was thinking of a bare-bones version of the "fox and hound" electricians circuit tracer that adds a signal to live circuits follow where they go.  Definitely half-baked. I couldn't see the oven temperature setting, I forgot to turn the oven on, etc.