I know that the Canadian route, Goderich Exeter Railway (GEXR), the Clinton Sub, the Blackfoot route, and repoted on Train Sim forum, the Italian route ITALIA19-v3 all have this problem in OR but run fine in MSTS.
I was hoping OR V8 would solve the problem of routes that have tiles larger than normal. The ground textures are displayed as grey or white (no terrtex). The routes works but is quite bland with the grey textures. The route looks and runs fine in MSTS. It appears the tiles in this route, and a couple of the tiles in Blackfoot aren't split and 4km x 4km in size, something OR can't process. It's likely using quad-terrain tiles, where a single terrain tile covers the area of four. OR doesn't currently support that. Maybe this can be addressed in a future release. Thanks much to the OR team for the new V8!
Ron MP505 SLSF OK Sub
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Grey or White Ground Textures
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