The incident, which took place at 8pm on Saturday (July 27), saw a large group of men thrown off a train at Blackburn railway station.
It is believed they were involved in a fight on the train between Preston railway station and Blackburn.
A spokesman for British Transport Police (BTP) said: "A large of number of men, suspected to have been involved in the fight, were ejected from the service at Blackburn.
"It is believed to have involved fans from Burnley and Blackburn football clubs."
The train was the Northern 7.21pm Blackpool North to York service.
Officers would like to speak to anyone who witnessed the incident.
Witnesses can contact BTP by texting 61016 or by calling 0800 40 50 40 and quoting reference number 547 of July 27.