Network Rail is warning that there won’t be any trains between London and Bedford over the next two weekends.

Over the next two weekends, rail engineers will refurbish switches and crossings at West Hampstead to improve the reliability of the equipment. They will also renew 1km of track in north London – 600 metres at Hendon and 400 metres at Belsize Tunnel.

There will also be new switches, crossings and electronics installed as part of a rail junction being constructed at Radlett Strategic Freight Interchange.

And renewing more than 1.2km of drainage at Harlington in Bedfordshire to prevent flooding.

There will also be work on the Access for All project at Luton station, where an accessible footbridge and three lifts are being constructed. Piling and excavation work is underway in preparation for the new bridge being installed.

The work means that over 20-21st and 27-28th June, East Midlands Railway services between Sheffield/Derby/Nottingham/Corby and London St Pancras International will operate between Sheffield/Derby/Nottingham/Corby and Bedford only.

Rail replacement buses will operate between Bedford and Hitchin to connect to alternative train services to London.

Thameslink will have no trains running between Bedford and London.

Rail replacement buses will run between:

• Bedford and Luton
• Luton Airport Parkway and Hitchin via Luton
• Harpenden and Potters Bar via St Albans
• Luton and London

Trains will run to an amended timetable between London King’s Cross and Peterborough/Cambridge.

Full Thameslink details:

20-21 June:

No trains will run between Bedford and London.

Trains will run to an amended timetable between:

• London Kings Cross and Peterborough/Cambridge
• London Bridge and Brighton/Rainham (Sunday only)/Horsham
• London Victoria and Sevenoaks
• Plumstead and Rainham (Saturday only)

No trains will run between London Blackfriars and Sutton.

27-28 June

Buses will replace trains between Bedford and West Hampstead Thameslink.

A revised train service will run between:

• West Hampstead Thameslink and Brighton/Horsham (Sunday only)
• Kentish Town and Sutton via Wimbledon
• London Blackfriars and Sutton via Mitcham Junction (Saturday only)
• London Bridge and Rainham (Saturday only)

Rail replacement buses will run between:

• Bedford and Luton
• Luton and West Hampstead Thameslink
• Hitchin and Luton Airport Parkway via Luton
• Harpenden and Potters Bar via St Albans City

Tickets will be accepted at no extra cost on Great Northern and Thameslink trains between Hitchin and London.

On Sunday, no trains will run between London Blackfriars and Sutton via Mitcham Junction.