India, June 26 -- The fatal stabbing of 22-year-old Mayank Ramesh Lohar aboard a Mumbai local train has renewed scrutiny of security arrangements across the city's suburban railway network, with commuter groups arguing that the incident exposed vulnerabilities they have been warning about for years.

Lohar, a retail chain employee, was allegedly killed by fellow passenger Roshan Babu Suvarna inside a first-class compartment of a Western Railway train on Tuesday night following an argument.

Investigators said the accused escaped as the train reached Borivali station, jumping onto the platform before the train came to a complete halt.

For passenger associations, the episode has become a stark example of what they describe as weak surveill...