Yep. signal issue, never saw it before. Added ground wire back to electrical box and getting not one ligbt flicker from any of my locomotives.
I wired both outside rails to common every 3 foot dropped to 14 gauge wire along the entire layout. Over kill I know but for over 400 feet of track I have only 0.4 dropped max volts along the entire line. in 8 years building the layout never had a signal issue until I started closing off tunnels.
I think its a Murphy' s Law....
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