Passengers face rail delays during work schedule
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Passengers have been warned of disruption while a series of railway closures take place.
Network Rail is working to upgrade overhead power lines on Thameslink's rail network between Bedfordshire and London.
The project was scheduled to begin on Saturday and continue until 1 June.
Thameslink said rail replacement buses would replace trains on the affected routes, with journey planners updated every 12 weeks.
Sharing a full schedule of disruption online, the rail operator said the following closures were planned:
- 22 and 23 February - Bedford to Luton (Saturday) and Bedford to Harpenden (Sunday)
- 1 and 2 March - Luton to Mill Hill Broadway
- 8 and 9 March - no trains between Luton and London Bridge
- 15 and 16 March - Luton to Mill Hill Broadway
Customers using Chiltern Railways between Aylesbury, Buckinghamshire, and London Marylebone have also been advised about service delays.
Disruption has been scheduled while HS2 viaduct works are carried out near Wendover.
Chiltern Railways said there would be no services between London and Aylesbury Vale Parkway (via Amersham) on Saturday and Sunday.
"As a result of the planned engineering works, the railway is closed between Amersham and Aylesbury all weekend," the train provider added.
Rail replacement buses were due to operate in both directions across the weekend.
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