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UP - Gray Summit Tunnel


Gray Summit Tunnel

Looking south along the UP Jeff City Sub

Photo taken by Nathan Morton in January 2007


BH Photo #127235



This tunnel is the eastern of two bores dug in 1929, when the Missouri Pacific Railroad was adding a second parallel track on their busy St. Louis to Kansas City mainline and sought to reduce gradient, curvature, and route miles. The original right of way, built in 1853, crested the watershed boundary between the Meramec and Missouri Rivers here, and was at the top of an ascending grade from both directions on the railroad. In 1845, with the anticipation of the railroad bringing travelers through the area, New York businessman Daniel Gray built a hotel on the ridge, known at the time as "Point L'Abaddie", near where the railroad was surveyed to be built. His name was given to the depot and the new settlement: 'Gray's Summit'. On December 22, 1982, all Missouri Pacific properties were acquired by the Union Pacific Railroad Company, which has continued regular rail service through the tunnel.


Tunnel underneath the town of Gray Summit on the Union Pacific Railroad
Franklin County, Missouri
Open to two-track railroad traffic
Bored when the MPRR line Through Gray Summit was rebuilt to handle increased rail traffic.
- Missouri Pacific Railroad (MP; MoPac)
- Union Pacific Railroad (UP)
Approximate latitude, longitude
+38.48977, -90.81714   (decimal degrees)
38°29'23" N, 90°49'02" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/690377/4262415 (zone/easting/northing)
Quadrangle map:
Gray Summit
Inventory number
BH 21488 (Bridgehunter.com ID)


Built 1929 (992)
Built during 1920s (9,770)
Franklin County, Missouri (82)
Missouri (6,262)
Missouri Pacific Railroad (370)
Open (39,434)
Owned by railroad (12,100)
Railroad (15,192)
Tunnel (1,213)
Union Pacific Railroad (2,346)

Update Log 

  • November 16, 2010: Updated by Brian Parkinson: The comment below claiming the photograph to be of the Labadie tunnel is false.
  • April 13, 2009: New photo from Nathan Morton
  • November 7, 2008: New photo from Nathan Morton


  • Nathan Morton - morton890 [at] yahoo [dot] com
  • Brian Parkinson - railstoruin [at] yahoo [dot] com


Gray Summit Tunnel
Posted March 19, 2011, by Brian Parkinson (railstoruin [at] yahoo [dot] com)

Here is an old photograph, regional map, and street plan of the old town of Gray Summit, I've found no date, but I'll guess around 1900. The city map reveals a small spur track leaving the railroad east of the townsite, where limestone was quarried and shipped out by rail.

-Brian Daniel

Gray Summit Tunnel
Posted January 15, 2009, by Brian LeDoux (louielouie42 [at] yahoo [dot] com)

This Photo os not the Gray Summit tunnel, it is so long and curved that you cannot see the light at the end of the tunnel. You have a view of the Labadie tunnels listed, not Gray Summit.

Gray Summit Tunnel
Posted January 19, 2007, by Nathan Morton (mortons03 [at] sbcglobal [dot] net)

January 2007 from west portal.