Well, I don't know what to tell ya!? I was all ready to tackle the merge with your info, when the wife told me one of my old working buds was on the way to the house. Oh, poo I thought (something like that), just when I was hoping to fix it up. I took one last look at it, removed 3 "tiles?", tried the merge again, saw all the same error messages, but for some reason I now have the 2 sections of the map joined and it looks fine. The 3 tiles I removed were overlapping. I guess that was the problem. Thanks guys, stay healthy, I'm sure I'll need your advice many more times! 
Thanks, again, cheers.......Rick
Good morning gentry; Well, I got 3 parts of the route merged. I have to do it a little differently than I am supposed to. Most of the route is no longer there, but it does show up as a trail, which is what it is in real life. When using TransDEM I cannot see the trail in the first part of the operation. I have to put a small section of track on the map and then move on. On the next map I can now see the trail and lay out the route. All SEEMS to be going well.  Luckily I can see the trail for the whole route clearly marked in open street view with a _ _ _ kind of line. The two sections I added line up perfectly in all dimensions. There was a "bare baseboard" strip on the second section of the route where the third section joined. Lucky for me it was an over lapping area and I just removed it. I hope it keeps going smoothly. I'm not deleting any of the parts of the route or the sessions that are showing up for some reason. When I get the map done I may need your expert help again, if I can't figure out how to save the work and back it up somewhere. It's great to know that some Trainz gurus are here, willing to help those with smaller brains! Thanks for all the help I have been given. Maybe someday I can help someone.
 
Cheers........Rick