The ground texture on my Tirol: Brenner - Kufstein Route (Steam DLC) is missing, appearing many yellow grids on the surface as shown in the screenshot! I have tried to redownload in Steam the route many times but nothing changed... The route was bought from Steam, and incially the ground texture can be clearly loaded, but now it appeared this bug!
The route requires the European Loco & Asset Pack. Can you check if you have the folder ...\Steamapps\common\RailWorks\Assets\Kuju\RailSimulator\ ?