The derailment occurred on a bridge between Salakati and Basugaon stations at about 5.15 A.M., spokesman for the North Eastern Frontier Railway, Pranav Jyoti Sharma, said here.
The motorman and the assistant driver of the train are among the four persons who picked up minor injuries in the mishap and have been admitted to hospital.
A relief train was immediately rushed to the site bearing the necessary help, including medical aid.
Senior railway officials from the railway headquarters, Alipurduar Division and New Bongaigaon have reached the site to lead the restoration work.