In short, I accidentally uninstalled TS without backing it up through Steam as part of a most unrelated process.
I have the folder containing the Railworks folder on a backup drive, and I don't have 22GB of data available to re download the entire program with the content I had. So the question is - is there a way to reinstall the game without re-downloading it?
So I currently have it running, with Steam active. But with the game seemingly uninstalled. Doesn't seem normal to me.