Three people were killed dead as several coaches of the Bikaner-Guwahati Express train derailed and overturned near Dohomoni in West Bengal's Jalpaiguri district on Thursday, officials said.
TV footage showed a number of coaches lying sideways down the elevated tracks as rescue workers were seen trying to extricate the passengers.
Sources said a relief train has been rushed to the spot.
Jalpaiguri district administration said some injured passengers were being rushed to a hospital in nearby Moynaguri.