Two men verbally abused a train conductor and tried to trip her up as she travelled on a service between Sheffield and Chapeltown.
The conductor had just finished her shift when she boarded a train at Sheffield station while still wearing her uniform.
Police said two men approached her and began verbally abusing her before trying to trip her up as she attempted to leave.
PC Wayne Heslop, of British Transport Police, said: “This was an unsavoury and completely unprovoked attack on a member of rail staff who was simply travelling home following her shift. Although incidents like this are rare, it was a very intimidating experience and we will treat this very seriously.
“I am appealing for anyone on the train at the time to come forward as a matter of urgency.”
Both men were white and in their mid to late 20s.
One was around 5ft 10ins tall, well groomed, of average build, with short light brown slightly ginger hair. He was wearing black trainers with grey laces and grey squiggles.
The other man was 6ft tall, clean shaven, of slim to medium build, with mousey brown wavy hair, and wearing a red and off-white hooded striped top.
Anyone with information about the incident on the 21.41 Northern service from Sheffield to Chapeltown on Monday, July 18, should call 0800 40 50 40.