At least 17 oil tankers of a goods train were charred when a fire broke out in the locomotive near Mariani in Assam's Sibsagar district, disrupting train services on the section.
Northeast Frontier railway sources said the accidental fire in the petrol and diesel tankers broke out when the train was coming from Numaligarh refinery at about 9.30 pm last night.
The guard and driver of the freight train carrying 51 tankers are safe, officials said.
Train services have been disrupted in upper and lower Assam as the main track has been blocked, they said. The Dibrugarh-New Delhi Rajdhani Express is among the trains disrupted by the fire.
Senior railway officials have rushed to the spot at a place between Barpathar and Bhirgaon and are making arrangements to clear the tracks.
