I have a U30C #935 Lionel 6-28241 which has to have it's features restored frequently. The symptom is that the smoke will not run except while holding down the "R" reset key on the CAB 2. Once restored, the features remain until they randomly don't. Some issue with the radio board? Susceptibility to electrical noise while running? Long term storage? The issue was first noticed after long term storage.
I guess bad R2LC. That is what is reprogrammed for features. Interesting. G
I have to go with George here, that data is retained on the R2LC.
It seems to be hanging in there today. I figured that it would fix itself if I addressed the problem. Kind of like going to the doctor. I lost it's mind with storage...and once after I restored it. But now it's steady.