The robbers stopped their car in front of Murkambi and started beating him. The quartet then fled the spot after looting gold ornaments worth Rs 50.7 lakh from him, he said.
While tracing the car, the police got an information that the vehicle was heading towards Rewa in Madhya Pradesh, he said.
The complainant had also provided description of the accused which helped the police to trace them since they were history-sheeters, he said.
A police team went to the Lokmanya Tilak Terminus (LTT) station from where some of the gang members had boarded the Kashi Express, he said.
On realising that policemen were hot on their heels, they got down at Igatpuri, about 150km from Mumbai, and got into a passenger train heading towards Itarasi in Madhya Pradesh, he said.
During their search, the police recovered at least 1,984 gram of gold ornaments, he said.
Upon their interrogation, the police traced and arrested the car's driver, the official said.
As of now, role of five persons in the robbery has come to light and a hunt is on for the remaining accused, he said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)