I was in scenario editor for my metra racetrack map and I wanted to add some tracks to build 16th street. I think it must have corrupted something because now that route is unplayable. How do I remove that dlc and redownload it? Would that even fix it?
If you haven't unpacked the route's .ap file it is easy. All your changes are saved outside of it. Go to RailWorks\Content\Routes\8c0780ae-47f1-4b64-9037-0abca7e43cf8\ and delete all folders except "Scenarios". (The "Networks" folder for example stores your manipulated tracks.) Alternatively, go to Steam Library, right-click Train Simulator, select Properties... -> DLC and untick Racetrack. Wait for activity to finish and retick it. The first method should already do the trick.