It's still there... https://store.steampowered.com/app/208286/Train_Simulator_Sherman_Hill_Route_AddOn/
Hello there. This shows the value of having backups... Backing-up your Railworks files could save you all deleted add-ons If you want to have some deleted add-on, you'll need to find someone with the files still intact. I think I have one of them on my old PC, not sure though. Cheers, ProfCreeptonius