Preliminary investigation revealed that the trio, of which two have been identified as Ramesh and Meena, died after allegedly being hit by a train while they were trying to cross the tracks, said a senior police official.
However, the police have yet not ruled out the possibility of foul play, the official said.
Locals found the body around 6.30 AM, following which police was informed. All three persons had severe skull injuries and Ramesh's arm was found severed from his body, the official said.
Once he was declared fit for statement, he helped ascertaining the identities of Meena and his friend Ramesh.
Also Read
However, the identity of the third person, could not be ascertained yet, said the official.
While Ramesh, was a resident of south Delhi's Moti Nagar, Surajbhan and Meena lived at RK Puram area, the official said.
The bodies of Meena and Ramesh have been sent for postmortem examination.