RTR SD70ACE Diesel"Creeping"Out Of Yard On Its Own

I had this problem years ago. Can't recall what the actual cause was but I would isolate the sidings and use toggle switches. I think it is better for the engine's electronics if they don't sit idle on powered tracks. It will also keep them from adding up the hours.

Also reduces the big power draw when you fire em all up.

I have had this happen when there is a spark on the circuit, as when a running train derails, or when I send a signal to another loco, usually to a spcific loco, indicating to me a possible garbling of ID #.  Latter was cured by changing loco ID#.

I like to leave sidings powered even when they contain a shut down loco, to charge batteries.

Perhaps an exorcism is in order.

Tried that.  Thought we had it cured when a huge puff of smoke and flame, and smell of sulphur, came out the stack.  But stealth mode returned.

[just kidding]

I've also had the same happen. Since I've been using the Rev.L TIU that doesn't happen anymore.

 I too had this happen. I really forgot about it so it must be fixed???

 I believe what was happening for me is a loco would get a check track message when signal was bad (or battery was dead on a problem engine). The loco would not respond correctly and would not change directions or accelerate. I believe the system left the speed at 1 or 2 MPH on the loco? Communication was lost and the locos crept? The remotes would show 0 MPH but the engines were stuck accelerating from the last command they understood. 

 When signal was good the problem didn't show up. When I had a TMCC product effect the signal, engines would creep, check track and error messages would pop up.

 I have been working on correcting the RR's signal problems. Too many engines or signal eaters had to be removed (or fixed). The creeping problem never came back? Joe

The only time I had this happen was when leaving the engine in the 'Active' list. Ever since I just move the engine to 'Inactive' when not running. But many claim to have have a problem moving the engine back to the 'Active' which I've never had.

I'd try RJR's suggestion.  Note whatever address the SD70 is presently at and re-add it at a different address.