Back in the day, several years ago when routes like this came on the scene, we needed a lot of Assets that aren't mentioned in the Read Me, as such, vegetation from RSDL and SAD - his German freeware route Altenburg - Wildau was used extensively for freeware content by many route creators in America, Britain and Europe, do you have any other old American Routes installed such as Port Ogden & Northern, or, Tennessee Pass, the C&O Allegheny route from Toripony, in your game, you need to download some of these to acquire Assets that make other layouts work properly.
Looking at your screenshot, it is also likely to be vegetation that is missing, grass, weeds, shrubs, bushes, etc, etc, as well as possible ground textures.
I have that route installed, I'll take a screenshot of that area and we can try and deduce what you are missing, stay tuned...........
Cheerz. Steve.
i7 10700k 3.8GHz Eight Core CPU, Gigabyte Z590 AORUS ELITE AX, 32GB RAM, nVidia RTX3060ti 8GB, WIN10 PRO 64-bit. 10TB HDDs in total.