An inquiry has been ordered into the derailment and three railway employees, including the driver, have been suspended in connection with the mishap.
The train travelling from Bihar's Rajendra Nagar Terminal derailed at around 9 PM last night near Shamuktala Road station, about 32 km from Alipurduar Railway Division headquarters, NF Railway officials said.
Initial reports had said that 10 persons were injured.
Two bodies were found from the coaches and they appeared to be those of monks going by their clothes and footwear, NF Railway CPRO Pranav Jyoti Sharma said.
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He said work is on to remove the derailed coaches from the track.
Rail traffic, which had been stopped in both up and down lines in a diverted route, is being gradually restored, he added.
About 150 of the stranded passengers were taken back to Alipurduar Junction by Kamakhya-Alipurduar Inter City Express. The unaffected portion of the train was detached. The train will resume journey once the relief operation is completed, he said.
Meanwhile with the derailed bogies removed removed from the tracks, train movement was inching back to normal, DRM Sanjeev Kishore said.
He said while three persons were still undergoing treatment, three others had been discharged.
None of the three undergoing treatment are in serious condition, the DRM said.