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HS2 Tunnel Milestone: Greatworth Tunnel Advances
10 Dec, 2025
Summary
- Greatworth Tunnel, 1.7 miles long, is HS2's longest "green" tunnel.
- A local road realignment marks a major step forward in construction.
- Lessons from Chipping Warden Tunnel improved productivity and speed.
The construction of HS2's Greatworth Tunnel, set to be the longest "green" tunnel on the line at 1.7 miles, has achieved a major advancement. The realignment of a local road has cleared the way for the next critical phase of excavation for this significant structure in south Northamptonshire.
Engineers are employing a cut-and-cover method, assembling the tunnel from precast concrete segments in an "M" shape. This approach, refined by lessons from the similar Chipping Warden Tunnel, has led to increased productivity and accelerated progress, with 0.6 miles already assembled. This progress allows for the reopening of roads and further community connections.
The Greatworth Tunnel is part of HS2's broader objective to improve journeys between London and Birmingham and enhance capacity on existing rail lines. While the overall project faces timeline uncertainties, this specific tunnel’s construction is progressing through the winter months, aiming to blend into the landscape and reduce local disruption.
