If I follow the reinstall advice listed above, I gather that my route creations will no longer appear in game.
A new install will only contain the assets that are built into the installation files.
IF you have not deleted your original user data folder (and this folder is not the same as the program folder that contains the Trainz executables) then all your original DLS, DLC and third party downloads plus anything you have created yourself will still be present on your system in the original user data folder.
The new install of Trainz+ will only look in its newly created user data folder for all your content so you have to redirect it to look in and use your original user data folder.
To do this you will need to identify the location (drive and folder path) of your original user data folder before you start the install. It is usually in the folder named ...
C:\Users\<your name>\AppData\Local\N3V Games\trs22\build xxxxxxxx but you could have moved it to another drive and/or folder path.
Notes:
- The folder trs22 is one of the parent folders because Train Plus will always report itself as being the latest retail version (TRS22).
- The xxxxxxxx will be a random sequence of letters and numbers. You may have several of these. If so then you will need to identify which one is the current user data folder - most likely the one with the latest modification date.
Record the full path name of this folder and,
after the new install, paste it into the User Data Folder setting in the Trainz Setting - Install tab.
If the above instructions are not clear, a more detailed set of instructions can be found on the Trainz Wiki at
How_to_Move_Your_User_Data_Folder