Have you tried clearing your train selection on the Quick Drive screen? It may be automatically filtering down to only routes you can run the Class 43 HST on.
Open your RailWorks folder and delete Content\SDBCache.bin Upon restarting, TSC will rebuild it and everything reappears.
Ignore clearing the selection as you can see it is giving you UK, US & EU routes. Do what Spikee1975 suggested in post #3