Its great that such an aged infrastructure as the Connaught Tunnel is still able to earn its keep but I always wondered whether it will become a longer-term liability. I hope not, as the service to south-east London is of strategic importance.
The work was significant and really created a new tunnel..
Refurbishment and modification to the existing Connaught Tunnel and approach ramps, including converting the twin binocular tunnels into one large-bore tunnel, requiring the central section to be removed and rebuilt by ‘cut and cover’ method enabled by two cofferdams in the dock allowing dewatering.
"In response to the impressive demand uptake on the Elizabeth line to date and the strong growth forecasts, an Elizabeth line upgrade plan has been prepared to assess further service enhancement opportunities. These proposals include additional services further west of Old Oak Common and additional services in the central operating section. We expect these to have strong business cases and will progress with further appraisal, operational feasibility and investment prioritisation over the coming year." (diagram shows long-term possible 30tph in core and also longer trains)
"We have also engaged with third parties to discuss the potential role for Elizabeth line services to support other proposed network extensions which could be reviewed as part of this Programme and understand their opportunities and impacts. These possible extensions include:
(a) Abbey Wood to Ebbsfleet, to support growth in North Kent;
(b) Heathrow to Langley via the proposed Western Rail Link; (c) Heathrow to Staines via the proposed Southern Rail Link.
Any future development of the extension proposals will be dependent on external factors including securing funding, local growth aspirations and confirmation of development potential."
[TfL Programmes and Investment Committee papers for 28 February 2024 meeting]