Flat Rock Tunnel

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Flat Rock Tunnel
Flat Rock tunnel, Reading R.R., length 940 feet, from Robert N. Dennis collection of stereoscopic views.png
Stereo pair view
Location Lower Merion, Montgomery County, near Manayunk, Pennsylvania
Coordinates 40°02′07″N 75°14′39″W / 40.03528°N 75.24417°W / 40.03528; -75.24417Coordinates: 40°02′07″N 75°14′39″W / 40.03528°N 75.24417°W / 40.03528; -75.24417
Status Active
System Originally Reading Railroad
Now Norfolk Southern
Work begun 1838
Opened 1840
Length 940 feet (290 m)
No. of tracks Originally Double
Now Single
Track gauge 4 ft 8 12 in (1,435 mm)

The Flat Rock Tunnel is an active railroad tunnel located on Norfolk Southern's Harrisburg Line near Manayunk, Pennsylvania, United States. The tunnel was built by the Reading Railroad for its line along the Schuylkill River.

Flat Rock Tunnel in Pennsylvania, western portal

Construction of the tunnel started in 1836 and it opened in 1840.[1] In 1858-9 the Flat Rock and Black Rock Tunnels were widened to accommodate the wider rolling stock from the Lebanon Valley Branch. The spacing between the tracks was increased from 4 feet (1.2 m) to 6 feet (1.8 m). The widening of the tunnel was the first project to employ electric detonation of multiple explosive charges.[2]

See also[edit]


  1. ^ Treese, Lorett (2003). Railroads of Pennsylvania: fragments of the past in the Keystone landscape. Stackpole Books. p. 41. ISBN 0-8117-2622-3. Retrieved November 7, 2009. 
  2. ^ "From Branch Line to Main Line: The Story of the Lebanon Valley Branch" (PDF). The RSME Timetable. Reading Society Model Engineers: 5. May 2007. Archived from the original (PDF) on November 20, 2008. Retrieved November 7, 2009. 

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