There are delays of up to 30 minutes on trains between Bicester North, Banbury and Oxford this afternoon due to a signalling problem.
A points failure between Bicester and Banbury has caused cancellations and disruption expected to continue until 3.15pm.
Routes affected include Great Western Railway services between Banbury and Oxford, Chiltern Railways services between Birmingham Snow Hill and London Marylebone and CrossCountry services between Newcastle and Manchester Piccadilly and Reading, Bournemouth and Southampton Central.
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