HS2 Completes Three Viaducts Spanning 1070m in Solihull

SOLIHULL, UK – High Speed 2 contractor Balfour Beatty VINCI achieved structural completion on three key viaducts in Solihull in early 2026, delivering 1,070 cumulative linear metres of elevated guideway near the future Interchange Station. The milestone concludes the main deck and pier construction for the River Blythe, Balsall Common, and Marsh Farm crossings. Final finishing tasks, including parapet installations and waterproofing, will continue through spring 2027.

What Is the Full Scope of This Project?

The Solihull viaduct package provides structural continuity across regional flood zones, watercourses, and local transport infrastructure through three separate elevated crossings. The largest structure, the 495-metre River Blythe Viaduct, stands 12 metres above ground level and rests on 19 split Y-shaped piers designed to reduce concrete volume while crossing an environmentally protected Site of Special Scientific Interest. The 430-metre Balsall Common Viaduct rises eight metres over the existing Network Rail corridor, local roads, and Bayleys Brook, which required a 150-metre river realignment to facilitate construction. The third asset, the 145-metre Marsh Farm Viaduct, was structurally completed in summer 2025 and stands five metres high, currently functioning as an internal site haul route to remove heavy construction transport from municipal roads.

Key Project Data

How Does This Compare to Similar Projects?

Civil viaduct delivery forms 15 kilometres of the total HS2 Phase One alignment across more than 50 major structures, reflecting high UK civil engineering costs relative to global high-capacity rail lines. By comparison, railway infrastructure expansion in China involved 3,125.28 route-kilometres of elevated and subterranean high-capacity metro systems under simultaneous construction across 58 cities at the end of 2025 (Source: East is Read, 2025). While HS2 viaduct engineering has focused on community-mandated aesthetic modifications and ecological passages, global metro civil programmes prioritize rapid modular construction to keep pace with demand, such as the South Korean rail network which is projected to expand at a 4.7% compound annual growth rate through 2036 (Source: Future Market Insights, 2025). The individual capital cost breakdown specifically assigned to the Solihull three-viaduct civil segment was not publicly disclosed by HS2 Ltd at the time of publication.

Editor’s Analysis

Completing these three elevated spans secures the physical civil approach into Interchange Station, removing major structural risk from HS2’s northern sector. However, the lengthy operational timeline—extending parapet completion to spring 2027 before track laying and systems integration can begin—demonstrates the extended lead times of UK infrastructure delivery compared to international peers. Sustained execution efficiency will determine whether HS2 avoids further schedule drift as European equipment suppliers face escalating backlogs, underscored by Alstom managing record group orders of €27.6 billion (Source: Railway Pro, 2025).

FAQ

Q: What are the three viaducts completed by HS2 in Solihull?
A: The three structures are the 495-metre River Blythe Viaduct, the 430-metre Balsall Common Viaduct, and the 145-metre Marsh Farm Viaduct. All three were constructed by the Balfour Beatty VINCI joint venture.

Q: When will the Solihull viaducts be completely finished?
A: While all three bridges have achieved structural completion, ancillary civil works continue. Final installation of the 304 architectural parapets on the Balsall Common Viaduct is scheduled for completion in spring 2027.

Q: How do these viaduct structures protect local wildlife?
A: The clearance beneath the River Blythe Viaduct preserves ground and aquatic migration corridors for badgers, otters, bats, water voles, and great crested newts. Additionally, civil engineers realigned 150 metres of Bayleys Brook to accommodate the Balsall Common crossing without disrupting local hydrology.