Rail passengers are being reminded no trains will be able to call into London King's Cross on Saturday February 29 and Sunday March 1 as improvements, which will allow more trains to run between London and the north, continue.
Over the weekend work will be done to test signalling equipment at Stevenage station, where a new platform is set to be built, and to install new overhead line equipment.
These improvements are part of the East Coast Upgrade. Once complete Network Rail says it will lead to benefits including faster journeys, more frequent and reliable services and up to 10,000 extra seats on long distance services per day.
People are being advised to travel on Friday February 28 or Monday March 2 instead.
Further periods of planned engineering work will take place later this year, with the next weekend of no services to London King’s Cross on Saturday 20 and Sunday 21 June.