It's hardcoded to 32km as I understand it (and lower based on View Distance slider) - which is probably ok under normal conditions - maybe except for days with really clean atmosphere. Dev docs: Distant Terrain Texturing Re-included from TS 2012 the distant terrain generator has been re-enabled for TS 2014. Additionally the system now also generates pre-baked textures for terrain beyond the normal 4km square area textured by the original system. To generate terrain and textures: Firstly import as much terrain as is required and do all texturing for the route. The distant terrain will render up to 32km from the camera so import any nearby mountainous areas. Make sure to use the existing auto-texturing functionality so that rocky and snow-covered distant areas are marked. Save the route and reload
Now if only google overlays could be shown in distant terrain. It can in tve editor, so why not in the game play? Mountains, distant hills would look fab.
For mountains which the player isn't directly driving toward, you can also use billboard images (used in SFM Torino for example). And if you choose clear weather patterns without enough distant fog, TSC tends to look a bit bland.
But my somution would be neat, easy, and make the i viromemt so much more lifelike. I just built some extra terrain on the Mittenwald bahn. (The south inntal scenery was not represented) now if the goggle overlay had been on the terrain in the game play, it would have heightened the realism considerely.
