According to them, the accident happened at 6am on Wednesday when the train was on its way to the Dohazari Peaking Power Plant.
Rail links between Chittagong and the rest of Bangladesh remained cut off for seven hours due to the accident.
Chittagong Rail Station Manager Md Abul Kalam Azad told bdnews24.com that five wagons and the train’s engine derailed, blocking two tracks.
Four wagons turned upside down.
Bangladesh Railway East Zone Chief Engineer Abdul Hye told bdnews24.com: “We’re primarily suspecting that the accident took place as the driver entered the mail line ignoring signal.”
He said train’s driver Uttam Kumar Bhattacharya and his assistant Bidar Ali were suspended on charges of negligence.
Chittagong’s rail communications with Dhaka and Sylhet resumed at around 1:15pm following removal of the oil wagons from one of the tracks.