Police are appealing for help in finding the missing 14-year-old Charlotte Pengelly.
The schoolgirl, from Washingborough in Lincoln, was reported missing on Wednesday, June 13.
She is believed to have travelled to Leicestershire and London by train and may be in the company of an unknown male.
Charlotte was last seen in the early hours of the morning on Friday, June 15, when she was spotted on a train heading for Kings Cross Station.
She is described as white, 5'7" tall, of slim build, with light brown shoulder-length hair and blue eyes.
She was wearing a salmon-coloured jacket, beige trousers and black shoes.
Anyone with information should call police on 101 quoting incident number 351 of Wednesday, June 13.