Two bogies of the Puri-Shiridi Express detached from the engine near Delang railway station in Odisha, a railway official said on Tuesday.
All the passengers were safe but the incident delayed the train by an hour, he said.
The detachment took place few minutes after the train had left Jatni Station at 10 PM on Monday, the official said.
Coach numbers S-4 and S-5 got detached due to breakage of a coupling hook.
Jatni and Delang railway stations fall under the East Coast Railway zone.
Delang is about 30 km from Puri station.