Interestingly, initial probe revealed, the 'robbers' had appeared for a written test for police constable's post in Bhopal, said a GRP official from Bina station in Sagar district.
The passengers overpowered two of them, identified as Pramod Dhakad (22) and Suresh Verma (24), both from Madhya Pradesh's Morena district.
Around 12.30 am, as the Yeswantpur-Hazrat Nizamuddin Sampark Kranti Express (12649) chugged off from Bhopal station, the four men started looting passengers of cash and valuables at gunpoint, said Ravi Jatav, the complainant.
But Jatav (19), resident of Unnao district, and one of his friends got hold of Dhakad and Verma. One of the accused fired from revolver, injuring Jatav, but other passengers came to his help and pinned down the duo.
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They were handed over to GRP officials at Bina.
According to the initial probe, the accused had taken the written test for police constable's post held in Bhopal yesterday.
The country-made revolver and some cartridges were recovered from the arrested men.
Jatav, who was hit in the head and chest, and the two accused who were bashed up badly by the passengers, were sent to Bhopal for medical treatment.
A case under sections 394 (causing hurt while committing robbery), 397 (robbery with attempt to cause death or grievous hurt) and other relevant IPC sections has been filed. Bhopal GRP would conduct further probe, said the official.