A man has been arrested in connection with a serious sexual attack on a woman as she walked along a country lane in Shropshire, police said.
Detectives from West Mercia Constabulary are questioning a 19-year-old man over the assault near Oswestry last Monday.
The victim, in her 30s, was dragged into a field and attacked after getting off a train from Birmingham in Gobowen at about 6.45pm.
Investigating officers believe the woman, who was walking towards Hengoed, may have been followed from the train.
More than 20 officers are involved in the inquiry into the attack, which left the woman severely shocked and distressed.
Detective Superintendent Sheila Thornes, who is leading the probe, said: "A 19-year-old man has been arrested in connection with the incident and is helping with our inquiries.
"He is in custody at Shrewsbury police station where we are continuing to question him."
Ms Thornes added: "We are appealing for sightings of any vehicles parked up along the road from Gobowen to Hengoed between 6.30pm and 7.45pm on the night in question."
Anyone with information is urged to contact the incident room at Oswestry police station on 0300 333 3000.