Update
Police say there was no evidence of mechanical failure when a mobility scooter being ridden by a 96-year-old woman crashed on to train tracks at Kirrawee station yesterday.
The woman, a local resident, was in a serious but stable condition in St George Hospital on Friday following the accident, which occurred just before 10am.
Acting commander of Sutherland Shire Police Area Command, Acting Superintendent Steve Worthington, said officers viewed CCTV footage of the incident.
"There are no suspicious circumstances," he said.
"It appears the rider made an error in the operation of the scooter resulting in the fall.
"It was ascertained that the rider only had the scooter for about three weeks and this may have contributed to the error.
"There is no further investigation at this time."
Earlier - Thursday
A 96-year-old woman was seriously injured when the mobility scooter she was riding crashed on to train tracks at Kirrawee station this morning.
Initial reports suggested the brakes on the scooter failed while she was on the platform waiting to catch a train to Miranda.
The scooter landed on top of the woman. There was no train at the station at the time of the accident, which occurred just before 10am.
Danielle Traynor, the manager of Kirrawee Pic-A-Pet adjoining the station entrance, said the woman, who is a Kirrawee resident, had visited the pharmacy in Oak Road and then went to the station to catch a train to Miranda.
Ms Traynor said station staff went to her assistance and emergency services were called.
"A person on the station who saw it happen said it looked like the brakes failed or there was some other malfunction of the scooter," Ms Traynor said.
"She came out of the lift onto the platform and then went flying over the edge."
Three paramedic crews and a specialist medical team were dispatched to the scene.
Paramedics treated the woman for a facial injury along with serious hip and leg injury.
She was taken to St George hospital in a serious condition.
NSW Ambulance duty operations manager David Stride said, "This is such an unfortunate incident."
"Responding to any incident involving an elderly patient is a horrible feeling. We just want to reassure our patient as much as possible while we are treating," he said.
"Paramedics did a fantastic job given such a difficult location."
"It's so important to take extra care around busy areas. We need to take care of the vulnerable members of our community."
A Sydney Trains spokeswoman said all trains travelling away from Sutherland to Cronulla were stopped to allow emergency crews to assist the woman.
"Sydney Trains thanks the quick response of its staff and emergency services," she said.
