19th June 2023
NetworkRail:
Network Rail provides behind-the-scenes look at recent Severn Tunnel track upgrades as vital link between South Wales and England reopens
Region & Route:
Wales & Western: Wales & Borders
Severn Tunnel track renewal
Here’s how engineers installed 3.2km of new track, 5,200 new sleepers and 13000 tonnes of ballast -over a ten-day period - in one of the most challenging environments on our railway.
The railway between Monmouthshire and South Gloucestershire has reopened this morning (Monday 19 June) following a ten-day closure to improve reliability of the line through the Severn Tunnel.
Teams worked a collective 17,000 hours, night and day, to replace the worn and corroded track, which will make journeys more reliable and reduce the need for emergency repairs.
During the project, Network Rail and train operators kept passengers moving by using a diversionary route through Gloucester, with buses replacing trains between Bristol Parkway and Cardiff Central.
Originally built around 150-years-ago, the Severn Tunnel is one of the most challenging environments Network Rail maintains, due to the harsh salt-water conditions, which make for a corrosive environment.
This means the track, that usually lasts 25 years, needs to be replaced every ten.
The new sleepers will be coated in tin to extend their life.