Chiltern Railways has said trains will not be running between Banbury and Leamington Spa for at least a week following a major landslip on Saturday.
The rail operator has said services will be affected until at least Monday, February 9 after earth slipped near Harbury Tunnel in Warwickshire on Saturday.
Thomas Ableman, spokesman for Chiltern Railways, advised anyone with travel plans for the next week to prepare for the line remaining closed.
He said: “At no point was there a risk, but in terms of timescale of opening the line there is now 300,000 tonnes of earth and rock which is very unstable and could fall on to the track at any time.”
Network Rail is carrying out a detailed assessment at the site, with reports that land is still moving.
No direct Chiltern services are running between the West Midlands and London, with rail replacement buses running between Banbury and Leamington Spa stations.
Services between Banbury and London Marylebone as well as routes between Bicester, High Wycombe and Aylesbury are running as normal, although passengers are advised trains may be more crowded at peak times due to those displaced from their normal trains.
Chiltern Railways tickets are being accepted on Virgin and London Midland trains.
To download a full revised timetable for today (Monday), visit www.chilternrailways.co.uk/landslipleamington