The incident took place on October 4, when Abdul Hasib (24), who was travelling along with his relatives from Sikandarabad on a general category ticket in Rapti Sagar train, got down at Lucknow station to fetch water.
The train had started moving but he somehow managed to board the sleeper coach, police said.
As per the FIR lodged by his family members yesterday, Hasib was involved in a verbal duel with the TTE over the ticket who, in turn, called the RPF jawans and beat him up leading to his death, police said.
A case of culpable homicide has been filed against unidentified TTE and RPF jawans, they said, adding, investigations have been handed over to GRP Barabanki.