Major refurbishment of world’s largest mechanical signal box complete - International Burch University
King Edward Memorial Park Foreshore x
Tideway completes final shaft for London ‘super sewer’
May 28, 2021
Construction materials shortage
The current supply chain crisis could spark a long-overdue change for construction
May 28, 2021

Major refurbishment of world’s largest mechanical signal box complete

SBJ signal box front hero x

SBJ signal box front hero x

Work on the 117-year-old Grade II-listed Severn Bridge Junction signal box in Shrewsbury is now complete.

It is the largest operational mechanical signal box in the world, with the refurbishment its biggest in more than a decade.

The £250,000 project – carried out by Network Rail and MPH Construction and part funded by the Railway Heritage Trust – has allowed the entire three-storey building to be weather-proofed.

As part of the refurbishment the original single-glazed windows, installed when the building first opened in 1903, have also been replaced with new double-glazed units.

Other improvements include new timber cladding and holding repairs to the external walkway gantry and a full exterior paint job – including the famous ‘Shrewsbury’ signs that greet passengers travelling in and out the historic town by train.

The historic building has its original 180 levers inside with 89 still in use today and is responsible for signalling around 280 trains every day.

Engineers worked for more than 300 days, restoring the crucial part of the railway infrastructure which is a vital link for passengers and freight travelling between Wales & Borders and the rest of Britain.

Further improvements are also planned for the interior of the signal box over the next few weeks.

Network Rail asset engineer Darren McKenna described the structure as “unique”.

“Working on this refurbishment was an absolute pleasure,” he said. “The gantry repair was a big job and involved rope access teams working day and night to strengthen and replace the boards.

“We gave very careful consideration to a sympathetic repair that has managed to maintain the building’s Edwardian character while securing its future for many years to come.”

Meanwhile, MPH Construction construction manager Gareth Ellis said it had been a “fascinating project to work on”.

He said: “We started on site in October last year and knew that this was going to be a challenging project; restoring a Grade II listed building, working at height and being completely surrounded by track.

“However, we couldn’t turn down the opportunity to work on this iconic piece of railway infrastructure and even carried out some extra works, such as renewing the eye-catching Shrewsbury sign for passengers to see.”

Railway Heritage Trust executive director Andy Savage added: “We were delighted to give a grant towards the restoration of this iconic signal box, which clearly will have a long-term future.

“We congratulate the Network Rail team for their careful work in restoring the building.”

Network Rail signaller Darren Peake, who has been working at the signal box for around 13 years, said the improvements “will make a huge difference”, including being warmer in the winter with the new windows.

He added: “We used to have to put pieces of paper in the gaps of the old ones. In fact, when they replaced the windows, they found newspaper cuttings behind the frames from the 1960’s.

“The history of this building is fascinating, and I am extremely proud to work from here.”


Department of Civil Engineering: