Faster journeys between Cardiff, Manchester and Holyhead, have been introduced by Network Rail and Transport for Wales (TfW) after removing numerous historic speed restrictions.
Both companies joined forces to improve the route's service, by removing some of the speed restrictions on the Class 67 locomotives hauling Mark 4 carriages on TfW’s Premier Service trains.
These locomotives had previously seen their speed limited to in 40 places along the Marches Line.
A total of 38 of these restrictions have been removed by Network Rail, leading to more efficient journey times.
Passengers travelling from Cardiff to Manchester are already experiencing journey times shortened by almost 10 minutes due to changes such as signalling adjustments and the introduction of new signage.
Network Rail Wales and Borders programme manager, Alex Hinshelwood, said: "After three years of hard work and collaboration, the line-speed improvement project on the Marches Line has been commissioned.
"This allows all trains between Hereford, Crewe and North Wales to run at the same speed, bringing significant journey time improvements in time for the December 2024 timetable change."
He added: "When we saw the potential journey-time savings that could be made, we were thrilled to be able to help TfW deliver faster journeys for their passengers by realising the full capability of the railway.
"We are now looking at other locations across the Wales and Borders route where we can make similar line-speed improvements."
Transport for Wales planning and performance director Colin Lea said: "Working closely with our partners in Network Rail, we are delighted to have agreed these key line-speed improvements on the Marches line.
"These will initially prove to be a performance boost for us, meaning we can get more customers to where they are travelling to on time."
He added: "The Marches route is incredibly important, linking North Wales and the North West of England, to South Wales and services to the Cambrian coast and Birmingham.
"Speed improvements can only be achieved through close collaboration and with safety at the forefront, so this achievement really does show how train operators and Network Rail can work together for the benefit of customers and the economy."
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