trouble with the Edinburgh-Dundee route

Hello,

I'm having some trouble with the Edinburgh-Dundee route: The route went wrong when installing the game, and I'm missing over 3000 dependencies.
How can we easily reinstall it? Thank you in advance. This game was purchased and installed through "Steam"

Phil.

IN Steam, go to your library and select the game then right click and choose properties. Click the Local Folders tab and click Verify files and Steam should find and fix any broken/missing files. It may take awhile so be patient.

Or if not, then follow this guide
http://online.ts2009.com/mediaWiki/index.php/Help:In-game_Downloading

Thanks for your help.
When I do a check, trainz tells me everything is correct.
I still have 50 or so files missing, but they are "unknown", and I cannot download them.
If I open the route it looks OK, but I don't have a session to play. Is this normal?