There are ways to download mods from the Steam Workshop even if you don‘t have the game on there: https://steamworkshopdownloader.io
Just make sure that you add „_1“ to the name of the folder that you put into your mods-folder. Otherwise the mod won‘t be recognized.
This worked like a charm. Sadly the mod in particular on steam seems to have some issues with scaling of the trains.
But thanks anyway, you are a bro!