In a statement, the Brititish Transport Police said:
"A four-year-old girl, Emma Lifsey, sustained serious injuries and was airlifted to Sheffield Children's Hospital, where she was sadly pronounced dead in the early hours Wednesday, 5 December. Her family have been notified.
"The police investigation into the incident is ongoing and remains very much in the early stages. Officers are working hard to establish the full circumstances surrounding the incident, including how the vehicle came to be on the tracks at the time."