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Major rail disruption is expected across south Wales this weekend.

Passengers are being warned to plan their journeys in advance as work to electrify the south Wales main line will be taking place this weekend.

Engineers will be working on Saturday and Sunday to switch on the electricity running through the overhead lines between St Brides, Newport and Bristol.

At the same time work will be carried out to install the overhead line equipment will be carried out in the Cardiff area.

When the work is finished passengers will benefit from shorter journey times as the work will enable Intercity Express trains to run between London and Cardiff on electricity.

What does the disruption mean?

On Saturday buses will replace trains between Cardiff Central and Ebbw Vale/ Cwmbran /Chepstow and Bristol Parkway.

While on Sunday buses will replace trains between Bridgend and Ebbw Vale/Cwmbran/Chepstow and Bristol Parkway.

Bill Kelly, route director for Network Rail Wales and borders, said: "Electrification reaching Cardiff is a significant milestone as we continue to deliver the biggest upgrade to the Great Western mainline since it was built more than 175 years ago.

"We would like to thank passengers and our lineside neighbours for bearing with us as we continue to deliver this major upgrade project.

"We urge the public to remain vigilant at all times near the railway and to stay away from the electrified wires at all times."

Colin Lea, customer experience director for Transport for Wales, added: "This vital investment work by our partners in Network Rail will lead to faster journey times between South Wales and Bristol and London by the end of the year.

"Whilst the work reaches its final phases, there will be some disruption affecting our customers connecting between South Wales and Bristol.

"We are working closely with Network Rail and GWR to keep this to a minimum, but those travelling on the affected dates should check before travelling and stay fully informed about any planned changes."