Case Study

Sustaining Momentum on HS2: Providing Multi-Disciplinary Tunneling Expertise for the Northolt Tunnel East

The HS2 Northolt Tunnel East project represents a critical piece of the UK’s high-speed rail infrastructure. Spanning 3.4 miles between Greenpark Way and Victoria Road, this project involves the construction of twin-bore tunnels using massive 8.1m diameter Herrenknecht Earth Pressure Balance (EPB) Tunnel Boring Machines.

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Client

HS2 (High-Speed Two)

Main Contractor

Skanska Costain Strabag (SCS) Joint Venture

Duration

August 2023 – Ongoing

Equipment

Twin bore 8.1m diameter Herrenknecht EPM TBM

Tunnel Length

3.4 miles long

Testimonial

“They have supplied quality personnel over a broad range of trades, including TBM operators and miners to mechanical and electrical operatives”

“Tunnelcraft has the accessibility and availability to individuals with specialised skills and expertise required to build and operate the Tunnel boring machines and the supporting plant and equipment, including the conveyor system, grout batching plants, segment delivery and transport. They have supplied quality personnel over a broad range of trades, including TBM operators and miners to mechanical and electrical operatives. Tunnelcraft is a reliable and effective partner on the project with a collaborative approach, participating in regular meetings and site visits.”

Richard Gill

Tunnel Superintendent Skanska/Costain/Strabag (SCS) Joint Venture

The Challenge

The primary challenge was securing a consistent supply of niche technical talent capable of managing not only the TBM operations but also the complex logistical ecosystem surrounding it. The Main Contractor (SCS JV) needed a partner who could provide both high-volume labour and specialised expertise while maintaining a proactive approach to safety and workforce development.

The Solution

Tunnelcraft partnered with the SCS Joint Venture to provide a comprehensive, multi-disciplinary labour force. By leveraging a deep pool of specialised talent, Tunnelcraft delivered:

End-to-End Operational Support: Supplied a full spectrum of roles, from Pit Bosses and TBM Operators to specialised Mechanical Fitters and Electricians.

Logistical Management: Provided expert teams for critical support infrastructure, including Grout Batching Plant and Water Treatment Plant Operators.

Proactive Workforce Development: Participated in regular site visits and briefings to ensure safety and alignment with project goals.

Upskilling & Apprenticeships: Actively invested in the future of the industry by providing training and new apprenticeship opportunities on-site.