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Trains have had to be suspended between two Medway stations after torrential rain caused part of the line to flood.
The service between Gillingham and Rainham is not running because the Gillingham level crossing is under water.
A spokesman for Southeastern said: "We are working to get service back on as soon as possible, but are unable to say at this stage when services will resume."
Medway has been experiencing heavy rainfall this morning and into the afternoon, as well as thunder and lightening storms.