The deceased were identified Secondary School Certificate (SSC) examinee Md Yasin Sharif, 16, son of Farid Sharif, and Class-X students Md Rayhan Ruhin, 15, son of Ashraf Ali Mia, and Al Amin Khandakar, 15. They hailed from different villages of the upazila.
Azizur Rahman, officer-in-charge of Kashiani Police Station, said the train crashed into the motorcycle at the crossing at Biswanathpur around 2:30pm when the four students were trying to cross the rail tracks, leaving three of them dead on the spot and the other injured.
Severely injured Sohan Talukder, 15, son of Md Ahad Talukder, was admitted to Kashiani Health Complex.
The bodies were sent to the same hospital, he said.
Sub-inspector Ratan Boiragi said four friends went on sightseeing by the motorbike after enjoying the annual sports competition at Joynagar High School when the accident took place.