At around 11.15pm on Saturday, June 11, the victims boarded a busy train at Manchester Piccadilly after attending a music gig at the Etihad Stadium.
A short time after the train left the station, a man approached the victims and touched them both inappropriately.
During the journey he also approached passengers and said, “do you want to buy weed”.
Passengers then ejected him from the train at Deansgate station just after 11.20pm.
Officers are keen to speak to any witnesses or anyone with information to assist their investigation.
You were on the train at the time and witnessed the incident, or have any information, please contact British Transport Police by texting 61016 or calling 0800 40 50 40 quoting reference 2200058737.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
