One person was killed and 55 others were injured when 14 bogies of the Brahmaputra Mail derailed about 15km from New Jalpaiguri junction in West Bengal state late Sunday night.
According to media reports quoting railway sources, the train, which had set out from Guwahati, was headed for New Delhi when the incident occurred.
The injured are undergoing treatment at the North Bengal Medical College and Hospital in Siliguri. Rescue work was going on at a war-footing to clear the tracks and restore the railway-link to the northeast.
Following the derailment, movement of trains to the Northeast region was stopped.