A woman was inappropriately touched onboard a train she boarded at St Pancras International.

British Transport Police (BTP) are appealing for information following the sexual assault on the 21-year-old woman on the 7.48pm train headed for St Albans City Station in Hertfordshire on Wednesday August 24.

Det Con Vicki Bladen, BTP’s investigating officer, said: “The victim was travelling onboard the train when she felt someone touch her inappropriately.

“When the train arrived at St Albans City station, around 8.15pm, the victim left the service and as she was walking up the stairs, again felt someone touching her, before seeing a man push past her and run up the stairs.”

The victim was then approached by another woman who had witnessed the incident at St Albans, and also informed the victim that she had seen the same man following her around the platform at St Pancras International.

The suspect is described as white, aged between 45 and 55 years and of an overweight build. He had short dark hair, flecked with grey and a widow’s peak at the front. He was wearing a blue pinstripe suit with a white shirt.

Det Con Bladen added: “This was an unpleasant crime. One that made a young woman feel very uncomfortable.

“This type of offence is very rare on the railway but when we do receive such reports, BTP takes this crime very seriously. If you were at St Pancras, onboard the train, or at St Albans City station and have any information, I urge you to get in contact and assist us with the investigation.”

“In particular, I am very eager to speak to the woman who witnessed the incident and spoke to the victim afterwards”.

The female witness is described as white with blonde hair which was in a very short ponytail. At the time, she was wearing a grey jacket and a skirt with a pleat down the front. She also had a short gold chain with a large pendant on it.

Anyone with information can call BTP on 0800 40 50 40 or Crimestoppers anonymously on 0800 555 111.