Network Rail and the Environment Agency are closely monitoring groundwater levels near a tunnel in Brighton.
Groundwater levels at Patcham, near a key railway tunnel through the South Downs, have risen to 44m above average and a further rise of 3m will result in flooding.
“We are keeping a close eye on the groundwater levels at Patcham,” said Network Rail route managing director for Sussex Tim Robinson. “We can currently run Brighton Main Line services but if the groundwater levels rise above the railway we will have to divert trains around the problem.”
Heavy rain has also caused a number of landslides on the rail network in the south east and services are currently suspended between Oxted and Woldingham, Wadhust and Battle and at Redhill. Services through Chelsfield are also reduced as a result of a landslide.