No injury was reported but many passengers got stranded at the station because of the incident, they added.
After the passengers of Ma Tara Express had disembarked at Sealdah, the train was being moved to the car shed when one of its coaches derailed, blocking the 9A and 9B platforms that handle many of the long-distance services.
The derailment caused a delay for Darjeeling Mail, Gaur Express, Padatik Express and several other trains scheduled to leave Sealdah after 10 PM, the officials said.