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NS - Flat Rock Tunnel

Photos 

Flatrock02

Western portal, seen from the eastbound Schuylkill Expressway

Photo taken by D. Thomsen

Enlarge

BH Photo #170030

Map 

Description 

The Flat Rock Tunnel is an active railroad tunnel near Manayunk, Pennsylvania, USA. The tunnel was built by the Reading Railroad for its line along the Schuylkill River.

Construction of the tunnel started in 1836 and it opened in 1840. 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.

Originally double track, now single track.

Facts 

Overview
Tunnel under Flat Rock Hill on Norfolk Southern Railroad
Location
Lower Merion, Montgomery County, Pennsylvania
Status
Open to traffic
History
Construction started 1838, completed 1840 by the Reading Railroad, widened 1859-60. Height increased early 21st century
Railroads
- Conrail (CR)
- Norfolk Southern Railway (NS)
- Reading Railroad (RDG)
Design
Tunnel
Dimensions
Total length: 940.0 ft.
Approximate latitude, longitude
+40.03528, -75.24417   (decimal degrees)
40°02'07" N, 75°14'39" W   (degrees°minutes'seconds")
Approximate UTM coordinates
18/479168/4431701 (zone/easting/northing)
Quadrangle map:
Germantown
Inventory number
BH 45683 (Bridgehunter.com ID)

Update Log 

  • October 7, 2014: HAER photos posted by Dave King
  • July 23, 2010: Updated by D. Thomsen: Status open, Norfolk Southern

Sources 

  • D. Thomsen - dcthomsen [at] comcast [dot] net
  • Wikipedia
  • HAER PA-539 - Philadelphia & Reading Railroad, Flat Rock Tunnel, Beneath Flat Rock Hill, west of Schuylkill Expressway (I-76), West Manayunk, Montgomery County, PA

Comments 

Flat Rock Tunnel
Posted December 4, 2010, by Leonard F. Shaner, Jr. (Conrail6370 [at] hotmail [dot] com)

The tunnel was made taller so the double stacks train could go through. this was done by taking the top out some in the year of 1994.