Railway officials said that 22 bogies of the train were unloaded at the Navagachia goods yard. 25 bogies were to be unloaded at Katihar. After unloading the goods, the train was being taken back when the 26th bogie from the engine side and the 17th bogie from the guard side derailed, disrupting the entire track. The accident relief train will arrive and only then can the derailed bogies be removed.