Passengers and residents are being advised of long-term plans for the Cumbrian Coast Line after the closure of Whitehaven tunnel.

Following the discovery of historic mine workings ahead of a planned track renewal specialist engineers have been working to deliver a lasting solution for the line.

The extent of the work needed means Bransty tunnel, between Whitehaven and Corkickle is expected to be closed until spring 2026.

Network Rail is working closely with train operator, Northern, to keep passengers on trains as much as possible. Passengers can travel across much of the Cumbrian Coast Line, except through the circa 1km tunnel that takes trains through Whitehaven into Corkickle.

Rail replacement bus services are in operation to transport passengers between the seaside resorts while the work is ongoing.

Network Rail engineers recently began scheduled survey work on 25 July, preparing for planned track and drainage upgrades. However, investigations identified that the tunnel floor needs significant reinforcement to support heavy machinery required for the improvements, with the discovery of historic mining activity complicating the engineering challenge.

The extent of strengthening work needed means the tunnel cannot safely reopen until completion of comprehensive repairs. Specialist engineers are developing detailed plans to address the ground conditions, with the tunnel expected to remain closed until spring 2026.

Additional ground investigations will continue around the tunnel to build a complete picture of subsurface conditions. The work forms part of broader infrastructure improvements designed to enhance reliability on this vital transport link serving Cumbrian coastal communities.

Phil James, Network Rail’s North West route director, said: “The safety of passengers and staff is our number one priority and I understand that this is really disappointing news for passengers in this part of Cumbria.

“Our experts have spent a great deal of time examining the data and having it reviewed by peers in the industry. They all agree that this is the right thing to do while further investigation can be carried out and a specialist plan put in place.”