Melbourne train nightmare: Three-year-old twins were left stranded on the Brighton Beach platform after the train left with their nanny still on board

A fun trip to the city ended in a nightmare when a young nanny became separated from the three-year-old twins she was caring for while retrieving the stroller from a train in Melbourne.

Toddlers Alice and Charlie were left alone and frightened on the platform at Brighton Beach station earlier this week after the train they had just alighted from left with their nanny still on board.

Krystal Lewis-Smith helped the twins get off the train onto the platform before getting back on to get the stroller, but the doors closed.

She frantically pressed the emergency button to raise the alarm, but during the agonizing 30-second wait for a response, the train moved off.

A good Samaritan who got off the same train rushed to the aid of the distressed toddlers and stayed with them until they were reunited with their nanny.

Three-year-old twins Charlie and Alice are still traumatized by the horrific ordeal

“All I could hear were the screams of the children, which broke my heart as they could see me through the glass and their little brains said, ‘She’s not coming back,'” Ms Lewis-Smith said Seven news.

“The possibility that something could have gone wrong is really frightening.”

The twins’ mother, Kristin Hamer-Ryan, doesn’t blame the nanny and believes the train driver should have noticed her children were alone on the platform.

“That’s pretty careless, I don’t think he looked because I can’t understand why he didn’t see her,” the mother of four said.

“I feel terrible for her (the nanny) because I know she did everything she could to protect them.”

“It’s not about the risk of injury. It’s actually the risk of death.”

The twins are still traumatized by the horrific ordeal.

“They were a little shaken yesterday.” “Alice woke up quite a bit overnight, which is unusual,” Ms Hamer-Ryan told Sunrise on Friday.

“They definitely understand that something happened and were disturbed by it. “But I think we’re all just trying to keep things as normal as possible and stay calm.”

Krystal Lewis-Smith (pictured) had just gotten back on the train to get the stroller when the doors closed behind her

The young nanny is also still shaken.

“I feel sorry for her – she’s really traumatized by this and she’s obviously very sorry, although I really don’t think there was any guilt on her part,” Ms Hamer-Ryan said

She held the children’s hands and safely climbed over the gap with them. And they were literally standing safely on the platform, turned around, the stroller was at her hip and she went to push the stroller forward and the doors just closed.

“She pressed the button to open the doors several times while the train was still at the station, and when the train started moving, she immediately pressed the emergency buzzer.”

The mother and nanny aren’t the only ones demanding answers from transportation officials.

The twins had just gotten off at Brighton Beach Station (pictured) when the train doors closed and they set off with their nanny on board

Commuter John Nockles saw the stranded twins screaming and trying to run after the train.

The father of one stayed with them until the nanny returned to the station.

“It was stressful,” the father of one recalled.

“Obviously something went wrong and it needs to be investigated.”

Metro Trains says an investigation has been launched but did not comment on the measures it would take to prevent a similar incident in the future.

“This is a concerning incident for those involved – our priority is to ensure the safety of our passengers at all times,” a spokeswoman told Daily Mail Australia.

“Once station staff were made aware that unaccompanied children were on the platform, staff followed safety measures to ensure the safety of children and all parties were reunited as quickly as possible.”

“This matter is currently under investigation and it would be inappropriate to comment further.”

Metro Trains recommends that parents and carers with strollers board at the front of the train, where the driver is nearby, and ensure children get on and off with them.

MetroTrains is now investigating the incident. Pictured is Brighton Beach train station