Engineers are on site after a landslip has blocked a rail line forcing services to be cancelled.
Network Rail is on site assessing the damage and the required repairs after a landslip in the Bicester North area.
The line towards the Midlands is blocked and services between Oxford and London Marylebone are unable to run and will be cancelled.
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Chiltern Railways said a reduced service is able to run between Birmingham Moor Street and London Marylebone.
Disruption is expected to continue until Monday January 15 at the earliest, it said.
A landslip has taken place in the Bicester area (Image: Chiltern Railways/X)
Customers are advised to check the journey before travelling.
Chiltern Railways said engineers are "working as quickly as possible to repair the damaged section of railway".
It comes after a wall collapse and landslip at Yarnton caused widespread disruption last February with services between Oxford and Kingham paused for 11 days.
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