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Potters Bar Tunnel

East Coast Main LinePotters BarRailway tunnels in HertfordshireRailway tunnels in LondonUse British English from December 2025
Cutting between Hadley Wood North Tunnel and Potters Bar Tunnel
Cutting between Hadley Wood North Tunnel and Potters Bar Tunnel

The Potters Bar Tunnel is a railway tunnel on the East Coast Main Line in the United Kingdom between Hadley Wood and Potters Bar railway stations; at 1,214 yards (1,110 metres) in length, it is the longest on the line. Its two parallel bores carry four tracks beneath high terrain and the M25 motorway. The lines tolerate speeds of 75 miles per hour (121 kilometres per hour) on the slow tracks and 105 mph (169 km/h) and 115 mph (185 km/h) on the fast tracks, with a continual gradient 1 in 200 (5‰), which is uphill for trains heading away from London. The first bore of the tunnel was finished in time for the opening of the line in August 1850. Despite permission having been granted by Parliament in 1882, a second bore was not opened until 1959.

Excerpt from the Wikipedia article Potters Bar Tunnel (License: CC BY-SA 3.0, Authors, Images).

Potters Bar Tunnel
M25, Hertsmere

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Wikipedia: Potters Bar TunnelContinue reading on Wikipedia

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Latitude Longitude
N 51.683333333333 ° E -0.18055555555556 °
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M25
EN6 2SG Hertsmere
England, United Kingdom
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Cutting between Hadley Wood North Tunnel and Potters Bar Tunnel
Cutting between Hadley Wood North Tunnel and Potters Bar Tunnel
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