Eyewitnesses told UNI news agency nearly 54,000 gallon capacity water tank suddenly fell on the waiting 23 passengers on the combined platforms 2 and 3.
They are waiting to catch local trains.
Those injured were immediately evacuated to the Burdwam Medical College and Hospital where three persons succumbed to their injuries.
The Hospital Superintendent confirmed three deaths.
Hospital sources told UNI five are in critical condition.
The accident happened around 1230 hours, Railway sources said.
(With UNI inputs)