Borivali GRP has registered a murder case and launched a search for the accused.
Investigators have collected CCTV footage from railway stations and the train route. They are also questioning eyewitnesses who were travelling in the coach to establish the exact sequence of events.
Police believe the stabbing happened after the disagreement over keeping the train door closed during the rain. Efforts are underway to identify and arrest the suspect.
Questions over commuter safety
The incident has shocked regular Mumbai local train passengers, who depend on the railway network every day. While the investigation continues, Mayank’s family says they only want justice and hope such a tragedy does not happen to another family.
The case has also renewed concerns over security inside crowded local trains and the ease with which dangerous weapons can be carried during daily travel.