A 33-year-old Barnsley man has been arrested on suspicion of attempted rape following an incident in Sheffield train station last month.
The man was arrested on Saturday (December 10) following the incident on November 19, which took place on the 10.24pm train which was travelling to Leeds.
He has been bailed until January 20 while enquiries continue.
The investigation is ongoing and officers are continuing to appeal for information in connection with the incident.
Detective Inspector Mick Jackson said: “We have spoken to a number of witnesses already, but I believe there are still people who were on the train or perhaps on the platform who may have seen what took place, or have information about what happened prior to or after the incident which could help us to piece together what happened.
“Incidents of this nature on the railway network are rare, and it is vital that we establish the exact circumstances of what happened. The victim continues to be supported by specially trained officers as the investigation continues.
“I would like to hear from anyone who was on the train who has not yet spoken to police, who may have seen or heard anything that could help with our investigation.
"Pease contact me either by calling 0800 40 50 40 or by texting 61016 quoting reference 147 24/11/16.”