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I am having issues with all of my new Atlas O locos. The trouble appears to be a signal issue. The lights flicker randomly, horn and bell operation is a maybe, and speed control is sometimes not available. I have several Lionel TMCC and Legacy engines that have no issues, no flickering or control problems.  

I am running 4 loops of track, with a reverse loop splitting the center loop and several yard tracks off the reverse. All loops are connected with turnouts. I have isolated the center rails in several locations, as explained in a Barry's excellent DCS Companion book. Wiring is 14 gauge speaker wire in a star pattern all leads equal length. My layout is on the floor for now, to be sure everything works correctly before laying bench work and scenery. Power wires run from terminal strips and travel under tracks to each lock on. Layout is 23' X 13'. Power is from two Z-4000, one handle for each loop. Control is DCS and Legacy together. All tracks are on one level.

After spending hours researching this forum and Mike Reagan's youtube videos, I have tried many suggestions to no avail. I have installed ground plane wires between each loop, connected to outlet ground. I have check transformer phase, cleaned track, and eliminated the 6 way plug adapter. 

All of my DCS engines show "10" s on all loops and all Lionel locos operate flawlessly. Problem is just with Atlas locos. Three new F7s and an RS3, and and older C424 are sidelined until the cause is determined and fixed. As I have read on this forum, holding my hand over the locos immediately cure the symptoms. I have a few bridges one the layout, and when the locos travel through the flickering stops until they exit. 

What could cause an issue with numerous Atlas O engines but not with any Lionel's? The Atlas engines look terrific, but as I read in another post, are just book ends until fixed. Any suggestions would be appreciated fellows.

Thanks for reading, and in advance for any help.

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My issue was with the ground on the transformer after all. I was using a grounded multi plug adapter that allowed me to plug in both Z1000s and both the DCS and Legacy to the same outlet. I moved the control systems to another wall plug, removed the adapter, and plugged the control systems and transformers directly into the grounded wall outlet. That was the last of any signal issues. No booster needed for me at least. A good ground is paramount to signal quality. Good luck!

Clarkster is right, good ground is critical.   If you have an AC circuit tester you might want to check the outlet you are using to be sure it is grounded properly, especially if you live in an older home.  You can pick up a tester in any big box store or Walmart for $5-$6.  Also remove any power strip or surge protector, at least for now.

AC tester

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