The incident took place due to technical fault, as seven bogies of 12565 UP Bihar Sampark Kranti Express decoupled from the remaining bogies of the train which chugged on for some distance before the matter came to notice, Jafar Alam, Senior Divisional Commercial Manager of Samastipur Division of the East-Central Railway (ECR) told PTI.
Upon detecting that seven bogies had decoupled, the driver drove the train in reverse to the spot where the decoupled bogies were re-attached before it left for onward journey again, he said.