Howver, no one was injured in the incident.
In another incident, railway track men recovered two more bombs from the same place, a police officer said.
During routine inspection of the railway track, two bombs exploded at bridge pillar number 156/67 when the track men were trying to find out an unidentified object lying there that later turned out to be bombs, Superintendent of Police (SP), Railway, Jitendra Mishra said.
The track men later found two more bombs from the same place, he said, adding there was no no casualty or injury to anyone due to explosions, which he claimed, were of low intensity.
The police officials have rushed to the spot with bomb disposal squad to sanitize the railway track, he said.