Bertieboy,
I think I can help you. Your run-on sentence is somewhat confusing...
Sigh.
There's a possibility that your routes are open for edit so therefore they won't load up in Surveyor, or Trainz its self for that matter. Open up CMP and check for open for edit assets, commit any that are open and see if that helps.
Outside that, try a database repair. For TRS206 you need to delete the assets.tdx. Shutdown TRS2006 if it's open, delete the file, which is located in the director where TRS2006 is installed. You can then restart TRS2006 and let it rebuild the database. This can take some time, depending upon how much data you have.
John