A young woman was taken to hospital after a serious sexual assault at Leyland railway station over the weekend.
British Transport Police cordoned off the entrance and car park of the station while forensic officers carried out a detailed search.
The alleged attack happened in the early hours of Saturday morning. The 21-year-old victim was treated in hospital and later released.
Officers revealed an 18-year-old man had been arrested and was being questioned.
A police spokesman said: “British Transport Police officers have been at Leyland Railway Station investigating a report of a serious sexual assault.
“Police were called shortly after 1am on Saturday and an 18-year-old man has been arrested and is in custody.
“An area of the station was cordoned off and police have carried out searches and are interviewing witnesses.
“The 21-year-old victim was taken to hospital and subsequently discharged. Enquiries are continuing.”
The entrance to the station’s public car park on Moss Lane was blocked off with police vehicles while a search of the area was conducted.
A team of officers in white forensic suits combed the car park and scrubland around it.