Cllr Christine Robinson, deputy leader of Lewes District Council, praised East Sussex Fire and Rescue and other emergency services for their response to the incident.
About 150 people were on board the Southern train when it derailed on Thursday (August 13) at 3.55pm. Two people suffered serious injuries and 18 were hurt.
Cllr Robinson (Lab) said: “I am deeply grateful to the emergency services for their exceptional response to yesterday’s shocking train derailment.
“Their rapid arrival, professionalism and expertise, particularly East Sussex Fire & Rescue Service, was outstanding. There is no question that without their swift and coordinated actions, the number of casualties would have been significantly higher.
“My thoughts are very much with all the passengers who went through such a traumatic experience, and I wish those who were injured the speediest possible recovery.
“I also want to recognise the role of residents and ward councillors who supported passengers as they left the scene. Their compassion and willingness to step forward in a moment of crisis was truly heartening, and I thank every one of them.
“The cause of yesterday’s incident is now under investigation. I would urge people to stay away from the area so that emergency teams and investigators can carry out their work without interruption.”

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Lewes train derailment. Picture: Eddie Mitchell Photo: EDDIE MITCHELL