Network Rail is reminding passengers to check before they travel as the multi-million-pound upgrade of the Ebbw Vale line moves into its final stage.
Buses will replace trains between Ebbw Vale Town and Cardiff Central from Wednesday 15 November to Sunday 3 December as teams work around the clock to transform the line.
Engineers from Network Rail will carry out 1.2 km of track upgrades at nine different locations between Crosskeys and Crumlin, to complete the creation of a seven-mile loop to enable trains to pass in the future.
Elsewhere on the line, contractors from Siemens will finish setting up and connecting the new signalling system around the Park Junction area. This will help improve the resilience and reliability of passenger and freight journeys.
The work is all part of the multi-million-pound investment to provide an additional hourly service between Ebbw Vale Town and Newport. The transformation of the line has been funded by Blaenau Gwent County Borough Council via a loan from the Welsh Government, with the Department for Transport and Network Rail providing a further £17m to deliver signalling upgrades and track renewal.
During the 19-day temporary closure of the line, Transport for Wales will be running a bus service between Ebbw Vale Town and Cardiff Central. Passengers are urged to plan ahead at /www.journeycheck.com/tfwrail and
www.nationalrail.co.uk