NSfan:
Correct: digitrax.
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Thanks, Mike,
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CB's for each district.
The spst normally closed toggle buttons arrived and installed.
I had to push all of them to engage them, properly.
District 3 tested (middle CB). Output LED off and center LED on.
Push button resets it.
I think I'm going to like this method as, once it's off, one has to push the button to reset it, thus eliminating any possible severe damage happening to the command station or decoders instead of the old method where the command station kept beeping due to a short.