Balfour Beatty has won the contract to complete the electrification of the Great Western Main Line from Bristol to Cardiff.
Network Rail picked the contractor to carry out the final section of electrification along the 40 miles of track between Bristol Parkway and Cardiff Central stations.
The award comes after Balfour Beatty signed an early contractor involvement agreement with Network Rail, which has seen the contractor agree a level of scope, programme and cost for the works over the past four months.
ABC, a joint venture between Alstom, Babcock Rail and Costain, had originally been signed up as the electrification contractor for the region covering the Bristol and Cardiff but its contract came to an end in April this year.
The work will see the firm complete phases six, eight and nine of the Great Western electrification scheme. Work will commence immediately, with a completion date of December 2018.
The line from Bristol to Cardiff will be the last stage of electrifying the Great Western line after the transport secretary Chris Grayling decided to ditch plans for electrification past Cardiff to Swansea.
Network Rail told Construction News that ABC had been chosen to carry out early development works but no further contracts had been committed to the firm.
Balfour Beatty managing director for rail Mark Bullock said: “Our selection to deliver this important upgrade to the UK rail network builds on our partnership with Network Rail and recognises Balfour Beatty’s capability and expertise.
“Balfour Beatty and Network Rail have successfully delivered the Crossrail West Outer Electrification Programme to schedule and I look forward to passengers seeing the benefits which will come when this new section of electrification is complete.”