Work Item Summary
- Project Phase
- Phase 1
- Region
- Brent and Ealing, Hillingdon
- Contractor
- SCS JV
- Type of works
- Construction, Cross passage construction
- Estimated Start Date
- 22/08/2026
- Estimated End Date
- 30/11/2026
What we are doing
Construction of the 8.4 mile (13.5km) long twin-bore Northolt Tunnel is complete.
We are continuing with building the emergency and maintenance walkways inside the tunnel , with works ongoing until late autumn 2026. These walkways will allow passengers to safely evacuate a train and walk to the nearest cross passage and rescue train should there be an emergency.
The works to fitout the cross passages are continuing, the cross passages are short tunnels which connect two parallel running tunnels approximately 500 metres apart along the Northolt tunnel route. We are building the reinforced concrete secondary collars which will as as a structural frame that allow our next phase for the next phase for the final sliding doors to be installed. These works are expected to be completed by late autumn 2026.
HS2 is undergoing a comprehensive reset to ensure it can be built efficiently and for the lowest reasonable cost. This work is being carried out in stages and will be completed in 2026. We will provide you with updates on the reset and what this means for our plans to build the railway in your area.
Download information relating to these works
Find out more about
If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected]