MUMBAI, July 17 -- Two separate incidents of violence took place inside Mumbai's suburban trains within a span of a few hours on Thursday - one involving a scuffle that left two men with head injuries and another in which a woman allegedly used pepper spray during a dispute over seats. The incidents come close on the heels of two fatal stabbings inside local trains, both similarly after minor altercations quickly escalated into attacks. The first incident on Thursday took place at 12.30am inside the luggage compartment of a Parel-Ambarnath local while the train was in motion. According to Laxman Chavan, senior inspector, Dombivli GRP, an altercation broke out between Pritesh Kanojia, a Titwala resident, and two youth who boarded the train at Diva. Kanojia had stretched out, asleep on one of the seats, when Raju Waghe and Sahil Khandare, both 19-year-old Dombivli residents, boarded at Diva and asked him to sit up. This led to an altercation, which turned into a physical fight. "One of them was wearing a kada (metal bangle), which struck some of the other commuters. During the fight, Kanojia lost consciousness," said Chavan. "We are in the process of registering offences against both sides," he added. The injured passengers were taken to the Kalyan civil hospital, but one of them was referred to Sion Hospital for further treatment. Only hours later, another violent incident took place inside a local train, this one inside the ladies' first-class coach of a Kalyan-CSMT fast local. Railway officials said an argument broke out over seats after the train arrived at Kalyan at 8.33am. The dispute allegedly arose because a group of women commuters had undertaken a Dombivli-Kalyan return journey solely to secure seats before beginning their onward trip to CSMT. CR authorities said this often leaves passengers boarding at Kalyan without seats, resulting in frequent arguments during peak hours. "The altercation escalated when one woman allegedly took out a can of pepper spray from her bag and sprayed it on another commuter. The RPF and GRP personnel boarded the coach after the train reached CSMT and handed both the complainant and the accused woman over to the GRP for further investigation," said a CR official. Mumbai's local trains, the backbone of the city's transportation network, has seen at least four violent incidents in the last six months, including Thursday's incidents, two of them fatal. Last month, 22-year-old Mayank Lohar was stabbed to death inside a moving local train between Churchgate and Nallasopara on the Western Railway, after an argument broke out over keeping the coach door open during heavy rain. And, in January, a college teacher, Alok Singh, was fatally stabbed by a co-passenger while alighting at Malad station, also on the Western Railway. The stabbing was preceded by an altercation over right of way near the compartment door as the train pulled into the station. The Central Railway says it will enhance the emergency medical assistance available to commuters by expanding its network of emergency medical rooms (EMRs). Only three days ago, three passengers took ill inside a crowded air-conditioned local near Mulund after the train's cooling system stopped functioning during peak hours. At present, EMRs are operational at 12 stations. The railway has floated tenders to establish similar facilities at another 40 stations in the Mumbai division....