# HS2 high-speed rail construction progress

> Developing situation record from CLSTR: https://clstr.news/situations/hs2-high-speed-rail-construction-progress
> Updated: 2026-10-26T11:38:33.000Z. Sources: 3. Developments: 2.

The HS2 high-speed rail project in the United Kingdom has reached several major engineering milestones. Initial progress included the completion of the 320-metre Westbury viaduct near Brackley, which utilizes a ‘double composite’ design to increase efficiency, and the successful linking of the two halves of the 1.4km Wendover ‘green tunnel’ in Buckinghamshire.

Further developments involved the completion of the second viaduct over the M6 motorway near Chelmsley Wood. Using large hydraulic jacks, engineers positioned the final section of the 4,750-tonne structure over the motorway. This milestone marks the structural completion of both M6 South viaducts, which consist of two 320-metre-long parallel structures designed to facilitate travel toward London, Birmingham, and northern destinations.

## Timeline

### 2026-10-26: HS2 completes installation of second M6 viaduct

HS2 has completed the installation of its second 4,750-tonne viaduct over the M6 near Chelmsley Wood, marking the structural completion of both M6 South viaducts.

3 sources. https://clstr.news/cluster/hs2-completes-installation-of-second-m6-viaduct

### 2026-10-05: HS2 project reaches milestones with viaduct and tunnel completions

HS2 construction reaches key milestones with the completion of the Westbury viaduct near Brackley and the linking of the central sections of the Wendover green tunnel in Buckinghamshire.

2 sources. https://clstr.news/cluster/hs2-project-reaches-milestones-with-viaduct-and-tunnel-completions

---
Cite as: HS2 high-speed rail construction progress. CLSTR, https://clstr.news/situations/hs2-high-speed-rail-construction-progress