Major improvement work on the East Coast Main Line will affect passenger services across four weekends in March.

A range of railway upgrades are planned for various sites between York and Newcastle from Saturday 7 March to Sunday 29 March.

There will also be digital signalling testing on the southern part of the line in Hertfordshire on Sunday 15 March, meaning services between Peterborough and London King’s Cross are also affected.

Rail replacement services will be in operation over the four weekends and passengers are advised to allow more time for their journeys.

The work in the North East includes the renewal of more than 3.8km of track, as well as new switches and crossings (also known as points – the sections of track allowing trains to switch between lines) at three locations. Further progress will also be made in the £140m Darlington station upgrade, which will also see overhead line equipment installed as the project nears completion.

The improvements taking place include:

• Cowton, between Northallerton and Darlington: 560 metres of new track and renewal of switches and crossings
• Croft, south of Darlington: renewal of switches and crossings
• Aycliffe, north of Darlington: 1.3km of rail renewal and removal of disused material
• Northallerton: 485 metres of new track and renewal of switches and crossings
• Low Fell, south of Newcastle: 1.6km of track renewal
• Installation of overhead line equipment and switches and crossings as part of the Darlington station upgrade.
• On Sunday 15 March, there will also be further testing of new equipment in Hertfordshire between Welwyn Garden City and Hitchin, under the £1.4bn East Coast Digital Programme (ECDP).

The ECDP scheme is set to introduce digitally signalled passenger trains on a section of main line between Welwyn and Hitchin from later this year, meaning more reliable, greener and safer journeys. The rigorous testing process checks the interaction between lineside equipment, onboard equipment and signalling control at York Rail Operating Centre.

Gunnar Lindahl, joint operations director – Network Rail East Coast and LNER, said:   “We’re carrying out a significant package of upgrades on the East Coast Main Line this March to keep trains running safely and reliably for the millions of passengers who depend on the route. The improvements, including renewing track and switches and crossings as week as progress with the Darlington station upgrade and East Coast Digital Programme, are important steps towards an even more modern, greener, safer and more reliable railway.

“We appreciate this work does mean changes to weekend services, and we’re grateful to passengers for their patience while we complete these upgrades.”