Trying To Make The Tunnels To Disappear?

I'm in the process of changing the track speed on the RSSLO Karawankenbahn in the long tunnel.
It is 30kph thru at least half of the 8kms and I wish to increase the line speed.

I remember if I rename the scenery folder by adding an X to the name most items disappear from view but I still have the tunnel as it is and the hill side above it.

Is there some other folder I can rename to make the tunnel and hillside disappear whilst I change the track speed.

Thanks

Peter

 

Rename the Lofts folder.

 

And the Terrain folder to get the ground to drop out of the way.

 

Thanks Peter & Gary