Us RW Tools to list all scenery items used in the scenario.
Or follow the guidance from Bob Latimer's tutorial here:
How To Check and Fix Provider/Products in Scenarios
Chacal, thanks for the quick response. I performed your recommended steps with RW Tools. My heart rate boosted when I edited the xml file, but there were no problems. I managed to get rid of the mystery route, but the scenario will not upload due to third party content. I figured out the problem. I created another Marias Pass scenario and it would upload. Then I added the GTrax Berkshire steam loco. It would not upload. Apparently, Steam does not recognize its own DLC as DLC! I guess I pulled out alot of hair for nothing.
Why it doesn't recognize the NP Berkshire seems to be a Steam problem. Thanks anyway...
Down another rabbit hole we go....