The men allegedly robbed the passengers of Rs 30,000 on Sunday after offering spurious chewing tobacco to them.
Dayal, Santram, Ashok Kumar, Dayapal, Gurdev Singh and Ram Lal boarded the second air conditioned coach from Allahabad. They began playing cards and invited other passengers to join them.
Passengers beat up the six men suspecting them of stealing the money.
The police asked the injured passengers to alight from the train at the Kanpur central railway station. A case has been registered against the passengers who beat up the six men.