A fire between Sevenoaks and Orpington has left some Southeastern trains unable to run.
A message on the National Rail website read that the delays are expected to last until at least 4.15pm today.
"Trains are currently unable to run between Sevenoaks and Orpington via Knockholt," it read.
"Trains running between these stations will be delayed or diverted via an alternative route."
"There is a fire at a property near the railway line at Knockholt.
"The smoke from the fire is very thick, resulting in trains being unable to run between Sevenoaks and Orpington. The fire brigade are on site at the property, and are working to put out the fire."
National Rail added that trains are unable to run between Sevenoaks and Orpington and will be diverted via an alternative route after Sevenoaks. Dunton Green, Knockholt, Chelsfield and Orpington will not be served.
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