Two of the deceased were identified as Hakim, 17, son of Hafiza rRahman and Rabiul, 20, son of Jalaluddin of Shibganj upazila of Bogura district while the identities of others could not be known immediately.
In-charge of Pakshi police camp, Shahidul Islam, said some passengers, who were travelling on the roof of Khulna-bound Inter-city Chitra Express Train from Dhaka, fell from the roof after being hit by the girder of the bridge at Pakshi point.
Two of them died on the spot, he said.
On information, police recovered the bodies and sent those to a local hospital.
Assistant Sub-Inspector Kushtia Sadar thana Jahidul Islam, said one person was killed and four others injured as they fell from the train roof after being hit by girder of the bridge at Bheramara link point.