HS2 Halves Construction Time on Northern Porous Portals as Chiltern Tunnel Progress Accelerates Chiltern Tunnel North Porous Portal

HS2 engineers have delivered a major civil‑engineering milestone with the completion of the northern porous portals at the Chiltern Tunnel—specialist...

jonathand@cogn… Mon, 02/09/2026 - 09:50
Chiltern Tunnel Civil Works Complete in Major HS2 Milestone View inside HS2s Chiltern Tunnel

Construction of HS2’s longest tunnel has officially wrapped up, delivering a major civil engineering landmark for the high‑speed railway and marking...

jonathand@cogn… Tue, 01/20/2026 - 09:27
Second HS2 tunnel dig under Chilterns completed HS2 Chilterns tunnel

The second giant boring machine (TBM) building HS2 under the Chiltern Hills broke through at the tunnel’s northern portal late on Thursday afternoon.

... Peter Johnson Fri, 03/22/2024 - 13:05
HS2 Chiltern Tunnel hits construction milestone HS2 Chiltern Tunnel hits construction milestone

Teams working on the Chiltern Tunnel, the longest tunnel on the HS2 high-speed rail project, have completed excavation of 19 out of 38 emergency cross...

richardw@cogni… Thu, 11/23/2023 - 10:27
HS2 launches third tunnelling machine for further digging under London Engineers assemble HS2 TBM 'Lydia' at Atlas Road, London, via HS2

Following the success of the tunnelling works towards the ongoing Chiltern tunnel project, HS2 has launched the third of its giant Tunnel Boring...

Elliot Griffiths Thu, 04/13/2023 - 12:11
Final designs revealed for the North Portal of HS2’s Chiltern Tunnel HS2 Chilterns Tunnel North Portal view looking north, via HS2

HS2 has revealed the final designs for the North Portal of the Chiltern Tunnel, representing the last of seven key structures that will be visible for...

Elliot Griffiths Thu, 03/23/2023 - 12:47
HS2 progression: Florence and Cecilia reach the halfway point of their Chiltern excavation journey Chiltern tunnel with crosspassageway, via HS2

The ongoing 10-mile HS2 tunnel excavation journey under the Chilterns has officially reached the halfway point, seeing ‘Florence ‘and ‘Cecilia’, the...

Elliot Griffiths Wed, 02/01/2023 - 11:05
‘Florence’ and ‘Cecilia’ reach four-mile depth South portal of the Chiltern tunnel after launch of the TBMs summer 2021

HS2 have reached a major milestone in their Chiltern tunnel project as its has been revealed that their two enormous 2,000 tonne tunnelling machines...

Elliot Griffiths Tue, 10/11/2022 - 10:16
HS2’s cross passages are full steam ahead HS2 Chiltern tunnel cross passage formwork, via HS2

HS2 has officially begun the new phase of its construction process towards the delivery of tunnels stretching for 10 miles under the Chilterns, which...

Elliot Griffiths Wed, 08/24/2022 - 10:03
LMXLED lighting the way for tunnel applications Worker walking down the Chiltern tunnel

HS2 is the high-speed railway under construction between London, the Midlands and the north of England, and which will eventually form a new, modern...

Matt Roberts Wed, 05/04/2022 - 08:46
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RTM Issue 151

HS2 Completes First Six Underground Platforms at Old Oak Common Station

Focusing on the latest developments, innovations, and policy impacts in the UK rail industry, with a particular emphasis on sustainability, infrastructure upgrades, and future technological advancements.

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