tunnels

hi guys im having trouble making actual tunnels in the ground, not tunnels aroung tracks above ground. I have seen them in Aiolos but I dont know how to make them . could you please tell me how.

[Oscar]

They use 3d files to create the illusion of going underground. They never actually go underground, they go through a 3d object that is above ground. The 3d object is designed to look like part of terrain and incorporates a tunnel within the 3d object.

Say it like it is oscar

Unfortunatly NL dosnt have the capabilities atm to get tunnels to go underground

thanks guys. your help is great