1 vote

SOU - New Tunnel 24


NS 9425 with NS 215

NS D9-40CW #9425's headlights begin to show inside the bore of the new Tunnel 24, note the visible bare rock cut past the concrete entrance.

Photo taken by Alex Wood in July 2012


BH Photo #243760


Nemo Sampler

Alex Wood

Play video on YouTube


Replacement tunnel for bypassed CNO&TP/CS #24. Was built to increase clearance for modern rail cars. Approximately 40 to 50 trains per 24 hour period pass through. Track speed is 40 miles per hour. Most trains will sound horns before entering tunnel. Tunnel sits prior to a 1.25% grade. Trains northbound will enter throttled up for the climb, southbounds exit in full dynamic braking. Trespassing within the bore is strictly prohibited, dangerous and punishable by federal law.


Tunnel under Tunnels through Nemo Mountain on Railroad
Morgan County, Tennessee
Open to traffic, railroad tunnel, approximately 40 - 50 trains in a 24 hour period.
Built in 1962 as part of the tunnel bypass program which replaced tunnels 22, 23 and 24 with new 22 and new 24 and built the Emory River Bridge between the two new tunnels. It was placed in service Nov. 12, 1962.
- Cincinnati Southern Railway (CNTP)
- Southern Railway (SOU)
Tunnel mix of concrete and bare rock bore.
Total length: 2,248.0 ft. (0.4 mi.)
Deck width: 20.0 ft.
Vertical clearance above deck: 30.0 ft.
Also called
Nemo #2
Cincinnati Southern New Tunnel 24
NS #24
Approximate latitude, longitude
+36.06633, -84.65107   (decimal degrees)
36°03'59" N, 84°39'04" W   (degrees°minutes'seconds")
Approximate UTM coordinates
16/711544/3993859 (zone/easting/northing)
Quadrangle map:
Inventory number
BH 54666 (Bridgehunter.com ID)

Update Log 

  • October 8, 2014: New video from Alex Wood
  • April 28, 2014: New photos from Alex Wood
  • November 3, 2013: Updated by Ed Hollowell: Date, owner and history.
  • February 17, 2013: New photo from Alex Wood
  • November 30, 2012: New photos from Alex Wood
  • November 29, 2012: Added by Alex Wood


  • Alex Wood
  • Ed Hollowell - erhollowell [at] aol [dot] com