Engineers have been building a makeshift access road through fields close to the railway line at Leighton Buzzard in the aftermath of a major landslip.
Revised timetables will be operating throughout this week following Saturday’s incident.
Mark Killick, area director for Network Rail, said: “We recognise the impact this embankment slip is having on train passengers and we are working to rebuild the embankment as soon as possible.
“This is a must-do job to ensure the ongoing safety of the railway. We are using this as an opportunity to make this railway embankment even stronger and cut the risk of a future slip.”
“We are aiming to complete this work by Friday and can’t be any more definitive at this point. Regrettably this means disruption to passengers for the duration of the week while our teams work hard to make repairs.
“We will continue to keep passengers up to date as we complete this emergency engineering work.”
A London Midland spokesperson said: “As a result of the landslip we have been forced to cancel some services between Milton Keynes and London Euston. However, there are still a number of services running so passengers should plan their journey and check before they travel.
“We have arranged for as many London Midland services as possible to stop additionally at local stations and we are advising passengers that they can use their London Midland ticket on London Overground, London Underground and Southern services to help complete their journey. We will continue to provide customers with the latest updates on our website, www.londonmidland.com/landslip.
“We would like to thank our passengers for their patience whilst this issue is resolved.”