The natural "tree tunnel" also located at Ozark, AR.

Coming out of the "little tunnel" at Natural Tunnel State Park.

Local T50 emerges from Natural Tunnel

A helper runs light into the "Little Tunnel"

Loaded coal train for Georgia Power charges out of the Natural tunnel.

** This photo landed me the May spot in the 2006 Norfolk Southern Calendar** A GP50 & GP38-2 lead local T50 east out of Natural Tunnel. The tunnel is 850 feet long , 100 - 175 feet high.

A set of westbound NS pusher engines starts into 'Little Tunnel' just before entering the larger and more impressive Natural Tunnel.

An eastbound CSX trackage rights coal train eases out of the impressive Natural Tunnel on the NS Appalachia District. Using a new 12mm lens shows the size of the train in relation to the surroundi... (more)

Utilizing the 'natural' tunnel created by the waters of Stock Creek, NS empty hopper train 729 drags itself through the tight curvature inside the tunnel behind a BNSF SD60M. [Canon D60, ISO400, 1... (more)

Light helpers returning north to Big Stone Gap.

I am pretty sure this is the only natural tunnel on the doubletrack Cal-P mainline between Oakland and Sacramento. Shot shows westbound Capitol#544 exiting Tunnel #? at Rodeo.

A Westbound grainer leans into the curve as it exits a natural rock tunnel in the Columbia River gorge.

NS #6792 is just outside Duffield ready to duck into the Natural Tunnel ahead.

Coming out of Little Tunnel and about to enter Natural Tunnel on a westbound empty hopper train.

About to head through Little Tunnel on a westbound emtpy coal train. As soon as we come out of this first tunnel, we will cross Stock Creek and enter Natural Tunnel.