Armed men struck the Bangalore-bound Sanghamitra Express and robbed passengers of a sleeper coach while the train was passing through adjoining Mirzapur district in the wee hours of Sunday.
Three of the nine robbers were later arrested and the suspension of two GRP constables for laxity recommended.
The dacoits boarded the train coming from Patna at Mughalsarai late Saturday night and began robbing the passengers of their valuables as it headed for Mirzapur, Superintendent of Police (Railway), Allahabad, A K Tyagi said. Later fled after pulling the chain to stop the train.