The southbound railway line between Banbury and Leamington Spa is currently blocked due to a landslip on a section of the track at Harbury Tunnel near Bishops Itchington.
Trains services between Banbury and Leamington are currently suspended and there are replacement buses.
There is also a shuttle train operation between Birmingham Moor Street and Leamington Spa which may be more convenient for passengers travelling north of Banbury.
Chiltern Railways has stated an inspection team will assess the landslip within the next hour.
No estimate of how long the line will remain closed can be completed until this has been carried out.
Services south of Banbury are running but passengers may experience some short term delays.
More updates will be posted here as we haev them.