I noticed recently that some of the routes I have are missing, strangely they are installed and bought. I cleared the cache but didn't fix the issue. Is there a way to fix this?
Yes. Sometimes the scenario database gets corrupted. Delete the file RailWorks\Content\SDBCache.bin. It will be rebuilt the next time you start TS. Note that it may take a few minutes depending on how big your TS library is.
Have you recently purchased these route or have you played them before? Some non DTG routes don't have Career Scenarios and you need to look under Standard Scenarios Go in to the Game then Build>Scenarios and see what the route has to play. Checking the route in the editor will show you their name and types