The derailment damaged 100 meters of railway line leading to cancellation of eight trains on the route. The Dibrugarh-New Delhi Rajdhani Express has also been detained at Lumbing, railway officials said.
They said the engine and 10 coaches of the train derailed near Jagiroad in Morigaon district at around 2 am.
Nineteen passengers were seriously injured and have been admitted to various hospitals including GauhatiMedicalCollegeHospital, police said.
Many passengers were discharged after receiving first aid in MorigaonCivilHospital.
The cause of the derailment is being investigated, railway officials said.
Senior railway officials have rushed to the site and rescue operations are on.
Helpline phone numbers have been activated: Dimapur 03862-228404, Lumding 03674-264848/49/50 and Guwahati 0361-2731621/22/23