NETWORK Rail will soon begin major preparation work in the run up to electrifying the South Wales Mainline.

It is hoped the electrification of the railway between London and Swansea will provide faster, greener, quieter and more reliable journeys for tens of thousands of passengers as well as stimulating economic growth across the region.

In order to accommodate the overhead lines which will power the electric trains, some road, foot and rail bridges that span the mainline will need to be raised, either by amending the existing structure or demolishing the existing bridge and building something new in its place.

The electrification project has a phased approach to minimise disruption to communities, with work moving from east to west.

Work on the first bridges in South Wales will kick-start in Monmouthshire this spring.

Graeme Tandy, route delivery director for Network Rail, said: “Electrification will transform the railway between London and South Wales to make journeys faster, more reliable, greener and quieter for passengers. It will also help support economic growth across South Wales.

“In order to reap the benefits of an electrified railway, an extensive construction programme is first required, including work to prepare the line for overhead lines. This will begin in Monmouthshire shortly and will include work to a number of existing bridges that are too low to accommodate the new infrastructure. We try to avoid reconstructing bridges where possible, but at some locations it is the only feasible option, particularly if a bridge is in poor condition.

"Once this work is completed the reconstructed bridges won’t need to be replaced for more than 100 years.

“I apologise for any disruption caused, but I want to reassure local communities we will complete the work in the quickest and safest possible way to minimise disruption and work with local authorities to plan appropriate diversions.

“We will begin holding drop-in sessions for residents this spring and I would encourage people to come along to find out about the work and the long-term benefits electrification will bring to South Wales.”

The first bridges identified as requiring reconstruction are two footbridges near Magor.

Work to replace Undy Halt footbridge, in the village of Undy, and Whitewall footbridge, which connects Whitewall Road to Magor village centre, is expected to begin in June and be completed by autumn.

The public footpaths over the current footbridges will be temporarily closed whilst the existing structures are removed and replaced with new footbridges.

The project is being planned so that work is staggered to eliminate the chances of neighbouring bridges being closed at the same time.

As part of the project, overgrown vegetation is being cut back along the railway in Monmouthshire to avoid it coming into contact with the overhead electrified lines.

Work to bridges and vegetation clearance is expected to be completed in 2016, piling work will then begin, which is required to install foundations which will facilitate overhead electrical lines.

Members of the public who are interested in finding out more about electrification in Monmouthshire are invited to public information sessions, which will be held between 2pm and 8pm on Monday, March 9 at Undy Church and Community Hall, Thursday, March 12 at  Magor Ebenezer Baptist Church, Wednesday, April 15 at Rogiet Village Sports Hall and Tuesday, April 21 at  Caldicot Town Council building.