RESIDENTS are being warned over noise levels during modernisation works along the south Wales mainline as part of Network’s Rail railway upgrade plan.

Network Rail have said piling work - the process of installing foundations for the steel masts and gantries that will carry electrified wires along the railway - will continue in south Wales for several months.

A spokeswoman for Network Rail said: “Piling is a noisy activity as it involves driving cylindrical steel piles deep into the ground to provide a secure base for gantries.

“There can also be noise from vehicle movements as safety rules dictate that a horn must be sounded when moving vehicles in the vicinity of the railway.

“Noise levels are dependent on the distance of homes from the train line and piling locations, which are installed every 50 to 60 metres.

“For safety reasons, the majority of piling will take place overnight when trains are not running and residents are advised to expect some disturbance whilst this work takes place.”

Andy Thomas, route managing director for Network Rail Wales, said railway is “vital” to economic prosperity, linking people, businesses and communities. He said they are continuing work between Monmouthshire and Cardiff to prepare the railway for the overhead masts and wires that will power trains running on electricity.

He added: “The new bi-mode trains, which can run on electric and diesel, will provide extra seats and faster services for thousands of passengers.

“I’d like to thank local residents for their patience.”

The spokeswoman said they are also replacing bridges that are too low to accommodate the new overhead lines. She said: “Rogiet Road bridge, in Monmouthshire, is on schedule to reopen this autumn. Hawse Lane bridge and Heol Las Road bridge, in Newport, are on track to reopen next summer.”