Thameslink and Great Northern rail services are set to be affected by "digital upgrades" over the August bank holiday weekend.
The upgrades will take place on a stretch of line between Welwyn Garden City and Hitchin, in preparation for digital signalling to be used from 2025.
This digital signalling system is already in place in many European countries, according to Network Rail.
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The change promises to "provide the foundation for the future expansion of digital signalling across the network", with digital signalling already in place for the London section of Thameslink.
Digital signalling is also in place on the Cambrian Line in Wales.
Passengers have been advised to use the National Rail journey planner, to plan their journeys ahead of setting out on the August bank holiday weekend.
Services may also be affected by a planned RMT strike on August 26.
More details of this strike will be released closer to the time.
Ricky Barsby, Network Rail’s head of access and planning for ECDP, said: “We’re encouraging passengers to check before they travel over the August Bank Holiday weekend so that their journeys run as smoothly as possible...
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"...We want to thank passengers for their patience and understanding in advance of the work and have carefully planned it so that it causes the least amount of disruption as possible.”
Jenny Saunders, Thameslink and Great Northern customer services director, added: “The work Network Rail is carrying out over the August Bank Holiday weekend is essential to delivering more reliable journeys for our Great Northern and Thameslink customers.
"Whilst the work has been planned to minimise disruption, regrettably, there will be some disruption to our customers’ journeys – particularly on Sunday, August 27- so please check ahead of travelling.”
The following changes have been made to the Thameslink and Great Northern rail services for Sunday, August 27:
- No trains will run between Potters Bar/ Hertford North and Peterborough/ Royston.
Rail replacement buses will run between:
- Hitchin and Royston
- Bedford and Peterborough via St Neots
- Hitchin and Peterborough
- Luton Airport Parkway and Hitchin
- St Albans and Hitchin via Welwyn Garden City
- Potters Bar and Hitchin
- Hertford North and Stevenage via Watton at Stone
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