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Trains in west Kent were suspended following concern for a man and woman on a bridge over the tracks.
As a result, no trains were running between Paddock Wood and Strood, with buses brought in to transport passengers.
The station closed at around 4.15pm and a roadblock was put in place on Buckland Hill.
An eyewitness said: "There were two people who jumped from the bridge in a hurry and landed on the pavement.
"One was wearing a pink hoodie and police were scrambling the minute they were off the bridge.
"It looked as if the people on the bridge had ran up Buckland Hill. A man was then escorted towards a police van."
The station reopened at around 6.10pm.
British Transport Police later said a man and woman were "refusing to come down from the bridge over the station were brought down and detained safely".
"They have been arrested on suspicion of robbery offences and obstructing the railway."
Passengers travelling from London St Pancras to Maidstone West were advised to use the Victoria Line and travel from Victoria to Maidstone East during the disruption.