The disaster took place just a little after 0300 hrs when the passengers were deep asleep and jolted as the train jumped off the tracks.
Four ordinary sleeper coaches of the train - S1, S2, S3, S4- were badly damaged in the mishap. The S1 and S2 coaches had telescoped into each other and most of the casualties were feared to have been in these two compartments.
The number of casualties kept on increasing by the hour and by afternoon 103 bodies were recovered, Commissioner (Kanpur Zone) Iftikharuddin said.
76 passengers were seriously injured in the derailment, IG (Kanpur range) Zaki Ahmad said.150 other passengers received minor injuries in the mishap.
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"Over 150 injured people have been rushed to nearby hospitals in the area. All hospitals have been asked to be alert. More than 30 ambulances have been pressed into service," he said.
Member (Engineering) will find out the cause of the mishap and action will be taken against those responsible, he said.
With several passengers feared trapped, rescue personnel employed cold cutters to break open the compartments as gas cutters produced excessive heat and suffocation hampering their efforts. A number of trapped passengers were rescued.
Teams of army doctors, railway officials and personnel of NDRF, state PAC and other policemen were involved in carrying out rescue and relief operation.