This seems to be a normal thing, but whenever a tunnel is placed down in the game, the ground is seen on the inside when there's terrain on it. The only solution I've seen is to use a dighole, but that causes there to still be a hole which I can't hide. I've looked on other routes (Reading & Northern, Mojave sub) so see how they accomplish their tunnels, and it seems perfectly fine. This has been a problem for me since using TS09/10 (now 12) and I used to be able to simply place the tunnel over the terrain with no problem. Any answers?