tunnels

[ttrigg]

Here's how I build my tunnels: First I level the area where the tunnel will be. Then I build up the walls of the tunnel out of concrete bricks. Next I add some dirt to the inside of the tunnel to build up the grade to the proper angle. After laying the track, I cover the top of the tunnel with concrete slabs about 1.5" to 2" thick. Then I build my mountain over it.

Except in my case, I put a waterfall on top of the tunnel.  Oh yes, my tunnel also makes a 90 degree turn on a 5 ft. radius.

[Anonymous]

I made my tunnel with a  chimney flue ,you can put several together they will not collapse , and fill over it to make a mountain with dirt or rocks .

           Ben

[rpc7271]

Check out mylargescale.com. A couple of nice tunnel ideas there.

[Ray Dunakin]

Here's how I build my tunnels:

First I level the area where the tunnel will be. Then I build up the walls of the tunnel out of concrete bricks. Next I add some dirt to the inside of the tunnel to build up the grade to the proper angle. After laying the track, I cover the top of the tunnel with concrete slabs about 1.5" to 2" thick. Then I build my mountain over it.

[toenailridgesl]

What Puckdropper said.

[Puckdropper]

Angle the track.

[railroadboy]

 how do i create an upward tunnel at a 10 degree angle for a battery powerd train