Blisworth Tunnel has no tow path inside, but is wide enough for two narrowboats to pass in opposite directions. Work began in 1793, but errors by contractor left a wiggle in the tunnel, and after three years work it collapsed due to quicksand, claiming the lives of 14 men. It was then decided to begin again with a new tunnel. By the time the rest of the Grand Junction Canal had opened between London and Braunston, Northamptonshire in 1800, apart from the crossing of the River Great Ouse, the section of canal from Blisworth to the lower end of Stoke Bruerne locks
Wansford Tunnel Heritage Railway. Just to the west of the tunnel the NVR has opened a new station, Yarwell Junction railway station, which opened to the public in 2007. The hamlet of Sibson is on top of the tunnel. Wansford Tunnel Wansford Tunnel is a railway tunnel on the preserved Nene Valley Railway in Cambridgeshire. The tunnel is situated to the south of the village of Wansford, but just to the west of Wansford railway station. It was on the Blisworth to Peterborough line opened in 1845 by the London and Birmingham Railway. The line originally was double track. Today, however only