MUMBAI, June 25 -- A 22-year-old man was stabbed to death inside the first-class compartment of a Churchgate-Nalasopara local train on Tuesday night, following a spat with a fellow passenger over closing the coach's doors to protect against a heavy downpour. The tragedy comes just five months after a 33-year-old Mumbai college professor was knifed to death by a daily wage labourer over a dispute about space in a crowded local. The incidents underscore the need for security systems across Mumbai's local trains, which service 8 million people daily. The victim of Tuesday night's attack, Mayank Lohar - a Virar resident who worked as a salesman at retail chain Westside's Andheri outlet -- succumbed to his injuries in the early hours of Wednesday. Hours after the incident, the Borivali government railway police (GRP) nabbed the assailant, identified as Roshan Suvarna, 30, in Panvel. According to an officer from GRP, Lohar was on his way home after his shift, when an argument broke out between him and Suvarna, who had also boarded the train at Andheri at 10:42 pm, over shutting the doors of the coach. Lohar wanted it shut while Suvarna insisted on keeping it open. The argument between the two escalated between Andheri and Borivali, said Dattaray Khuperkar, senior police inspector of Borivali railway police station, based on eyewitness accounts. Other passengers, who witnessed the incident attempted to pacify an aggressive Suvarna, who refused to calm down. Some tried to reason with him, asserting that everyone in the coach was getting drenched by the splash of rain. When Suvarna remained stubborn, in order to end the quarrel and protect Lohar from his hostility, a few passengers encouraged him to stand by the opposite entrance of the coach. None of the approximately 50 passengers in the coach however attempted to physically restrain Suvarna. Suvarna, nonetheless, continued his verbal abuse against Lohar, and between Goregaon and Malad stations, he allegedly unzipped his bag, pulled out a knife and walked up to Lohar to stab him in the chest and stomach three to four times. As the train was pulling into Borivali railway station's platform number 6 at 11.04 pm, Suvarna jumped off the coach and fled even before the train came to a complete halt. Western Railway authorities said that around 11.07pm, a team of GRP and RPF personnel reached the coach to attend to an injured Lohar. The victim was rushed to the Emergency Medical Room at Borivali station and then shifted to Shatabdi Hospital, Kandivali, where he died. Khuperkar said that after registering a case of murder against the then unidentified attacker, seven teams were formed which scanned footage of over 40 CCTV cameras from Borivali to Panvel, following which Suvarna was identified and arrested in Panvel. Suvarna, a Mira-Bhayandar resident, is a barcode maker who worked in the packaging section of the cargo hub of Mumbai airport. "We got the description of the accused through the video recordings of passengers. After attacking Lohar, the accused dressed in a pair of black trousers and a black shirt, paced the compartment carrying the knife," said Khuperkar. Police are yet to recover the knife. An investigating officer said while Suvarna has no past record of crime, they found he had picked a quarrel with an autorickshaw driver outside Andheri station over fare before he boarded the train. This incident highlights the need to establish security measures, such as increased vigilance and patrolling in long distance trains, a proposal made by GRP commissioner of police Rakesh Kalasagar in June 2025 after incidents such as the 2023 Mumbai-Jaipur train firing....