Bangladesh Railway has formed a seven-member committee to investigate the Gopibagh train fire incident.
The committee has been asked to submit its report within three working days.
Siraj-ud-Daula Khan, senior information officer at the Ministry of Railways, confirmed the matter early Saturday.
He said Dhaka Divisional Signal and Telecommunication Engineer Soumik Shaon Kabir will lead the investigation committee.
At least four people were burned to death in the fire which was reported on 9:05pm on Friday.
Seven firefighting units brought the blaze under control at 10:20pm, said Rakibul Hasan, duty officer of Fire Service and Civil Defence.
At least five compartments of the train have been set ablaze by miscreants.
Ashraf Hossain, sub-inspector of Dhaka Railway Police Station, said they received information about the fire from the emergency service number 999 around 9:07pm.
Police officials feared that people could be trapped inside.
