The explosive, weighing 800 gm and fitted with electrical wires, was hidden under boulders of track number one on platform two.
The bomb was noticed by people at around 9.30 am after the departure of a train and they informed the railway station officials who called in police.
Police cordoned off the area and took away the bomb to be safely defused later.
A letterhead of a little known insurgent outfit 'Bengali Sangram Mukti Bahini' was found near the bomb, police sources said.
Movement of trains was disrupted in the area for a few hours and traffic resumed after the bomb was removed.
Security has been intensified in the area.