TRAIN services between Oxford and Banbury and on the Chiltern Line are being disrupted by signal problems at Kings Sutton.
Network Rail engineers are trying to find the cause of the fault, which is believed to be linked to the power supply.
First Great Western and CrossCountry trains between Oxford and Banbury and Chiltern Railways services between Banbury and Bicester North are all affected.
Trains may be cancelled or delayed as a result.
FGW is trying to arrange replacement buses to link Oxford and Banbury.
For the latest information, see the National Rail website, or call 08457 484950.
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