Passengers in Oxford and the Thames Valley are advised to check before they travel following flood warnings for the region.
Network Rail expects it to affect the railway between Oxford and Didcot, with the possibility of disruption to the Henley and Marlow branch lines.
Engineers have been working trackside near Oxford removing sensitive equipment to prepare the railway for possible inundation.
Rail engineers have been out in difficult conditions across the south of the country today, repairing and monitoring the railway, while a good service has been in operation across the rest of the network.
