United Kingdom



Skanska-Costain-Strabag Consortium



Key facts

Phase 1: Lots S1 (Euston Tunnels and approaches) and S2 (Northolt Tunnels). A total of 24.4 km all within London. Maximum speed of 320 km/hour. BREEAM Infrastructure Scheme Certificate achieved with ‘Excellent’ rating

22.2 km of tunnel including:

– 20.8 km of twin-tube TBM tunnel (7.2 km with an inner diameter of 7.55 m; 5.5 km with an inner diameter of 8.10 m; and 8.1 km with an inner diameter of 8.80 m).

– 0.8 km SCL (Sprayed Concrete Lining) tunnel with internal diameters ranging up to 15.2 m.

– 0.6 km in cut and cover tunnel with spans up to 30 m.

2.2 km above ground with 2 under bridges and 3 over bridges, two over the Euston station approaches, 120 m long.

6 ventilation and intervention shafts and 1 evacuation shaft up to 45 metres deep.


Preliminary and detailed design of lots S1 and S2. Inclusion of numerous sustainability aspects during design and commitment to a 50% reduction of the carbon footprint during construction.


Bentley Year in Infrastructure 2018 Award. Best project in the Going Digital: Advancements in Rail and Transit category. Ground Engineering Awards 2020 in the UK Geotechnical Team of the Year category.

TYPSA is delighted to be a winner of the Ground Engineering Awards 2020

The SCS Design House team comprising ARUP, TYPSA and STRABAG has won the award for its work on the HS2 High Speed Project in London....

HS2 Main Works Civil Contract S1 and S2 winner of the Year in Infrastructure Awards for “going digital” and its innovative BIM approach

SCS (Skanska-Costain-Strabag JV) together with the Design House JV (Arup-TYPSA-Strabag), has won the Year in Infrastructure 2018 Awards. These awards are an integral part of...

HS2 High Speed Line, United Kingdom

In 2010, the British government decided to modernise and expand the high speed rail network with a new line to the North in addition to...


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