Passengers were ordered off a train after trouble broke out on the Robin Hood Line in Bulwell this week.
British Transport Police officers were called after a member of train staff was allegedly assaulted by a passenger on the 10.26 am service from Nottingham to Worksop.
The service was forced into an unscheduled stop at Bulwell station, where police officers boarded the train. About 20 passengers were told to leave and asked to wait on the platform for the next service, which was due to arrive at 11.05 am.
A spokesman for East Midlands Trains said: “Police were called following an incident on board. The train was terminated at Bulwell, and passengers were asked to use the next service.”
A spokesman for BTP added: “We were called to Bulwell station at 10.39 am after a disturbance on board a train. We have launched an investigation following a report that a member of rail staff, a 24-year-old man, was assaulted by a passenger. The man did not require hospital treatment. No arrests have been made.
“Anyone who witnessed the incident is asked to contact BTP on 0800 405040, or text 61016, quoting reference 195 of 30/06/2015.”