NS - Flat Rock Tunnel
Western portal, seen from the eastbound Schuylkill Expressway
Photo taken by D. Thomsen
BH Photo #170030
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.
- Tunnel under Flat Rock Hill on Norfolk Southern Railroad
- Lower Merion, Montgomery County, Pennsylvania
- Open to traffic
- Construction started 1838, completed 1840 by the Reading Railroad, widened 1859-60. Height increased early 21st century
- - Conrail (CR)
- Norfolk Southern Railway (NS)
- Reading Railroad (RDG)
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:
- Inventory number
- BH 45683 (Bridgehunter.com ID)
- October 7, 2014: HAER photos posted by Dave King
- July 23, 2010: Updated by D. Thomsen: Status open, Norfolk Southern
- D. Thomsen - dcthomsen [at] comcast [dot] net
- HAER PA-539 - Philadelphia & Reading Railroad, Flat Rock Tunnel, Beneath Flat Rock Hill, west of Schuylkill Expressway (I-76), West Manayunk, Montgomery County, PA