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Southeastern services were suspended after a person was struck by a train.
It happened between Sevenoaks and Orpington.
The person has since been pronounced dead.
A replacement bus service has been ordered to run between the two stations and was in operation at 3pm.
British Transport Police (BTP) spokesman Jordan Bluer said: "BTP officers were called at 1.57pm to a report of a person being struck by a train at Chelsfield railway station in Orpington.
"Officers remain at the scene. The death is not being treated as suspicious and a file will be prepared for the coroner."
Trains have since resumed but disruption to services continued into the evening.
Trains have also been suspended going into Ashford as another person has been hit by a train and in Northfleet after a dog got on to the train line