A schoolgirl who fell on tracks at Worcester Park station as she ran to catch a train is being treated in intensive care.
The 15-year-old, a student at Raynes Park High School, suffered massive blood loss in the accident and has had her spleen removed.
She also has an injured left foot, is thought to have a fractured pelvis and will undergo more surgery today.
The girl was taken away on a stretcher and rushed to St George's Hospital in Tooting as police cordoned off the accident site yesterday.
She is believed to be in a stable but serious condition and the next 48 hours are critical.
The incident caused chaos for commuters who were told to get off the 7.52am train from Epsom to London Waterloo at Worcester Park yesterday.
British Transport Police were called around 8am after the girl slipped and fell between the carriages and on to the track spokesman for London Ambulance Service said: "We were called just after 8am to reports of a person under the train at Worcester Park station.
"We sent two fast response cars, an ambulance and an officer to the scene; the first of which was there in six minutes.
"We treated a teenage girl who was taken to St George's Hospital."
Raynes Park High School's headteacher, Ian Newman, said the school was in regular contact with the family.
"Our thoughts are with family and friends at this time and we hope for a speedy recovery," he said.