The engine and three coaches of the train going from Barkakana to Patna jumped the rails following the blast, Chhipadohar railway station master R P Bhagotia said.
However, there was no casualty or injury to any passenger due to the derailment, Deputy Inspector General of Police (Palamau Range) Saket Kumar Singh said.
The station master said the blast occurred around 8 pm near Kuchila village between Chhipadohar and Barwadih stations.
The Communist Party of India-Maoist is observing a 24-hour bandh in Bihar and Jharkhand to protest against the gunning down of their cadres in Palamau district on June 9.