A Subarna Express coach carrying around 60 passengers caught fire at Laksam railway junction in Cumilla on Sunday morning.
No casualties were reported.
Akter Hossain, examiner of trains at the technical department of Laksam railway junction, said the fire was caused by friction between train wheels and springs, turning the axle hot.
A witness said the fire was seen under one of the coaches when the train was crossing Laksam junction at around 9am.
The driver immediately stopped the train upon hearing the screams of railway staff and passengers of coach no 6508.
The terrified passengers started to disperse haphazardly.
Railway staff said the passengers of the coach that caught fire were shifted to other coaches of the train.
The train left for Chattogram an hour after the incident, leaving the coach that caught fire behind.
Passenger Maksudul Alam, a resident of Agrabad in Chattogram, said he would have been burned alive if the fire spread to the entire coach or its upper part.