Thane, June 10 -- Four people died and nine were injured, two of them critically, when two overcrowded suburban trains on the Central Railway network passed by each other on sharply-curved tracks near Mumbra railway station on Monday morning. Eyewitnesses said the people hanging out of the crowded trains hit one another as the trains moved at high speed in opposite directions. The curvature narrowed the distance between the two sets of tracks. There is no official version as yet on the cause of the accident. CR is treating this as an "incident" and not an accident, so it hasn't formed any special committee to investigate, but relevant information is still being collected to identify the root cause, officials said. Monday's tragedy once again highlighted the perilous nature of Mumbai local travel, among the world's most crowded suburban rail networks. According to Government Railway Police (GRP) statistics, at least seven people die while travelling on trains every day. CR's chief public relations officer, Swapnil Nila, confirmed that eight people fell off between Diva and Mumbra stations around 9.10 am on Monday. "Emergency response teams, including ambulances and railway medical staff, were immediately dispatched to the site, and the injured passengers were swiftly transported to Chhatrapati Shivaji Maharaj Hospital, Kalwa, and the Civil Hospital, Thane, for prompt medical attention," he said. "The principal chief safety officer will conduct an inquiry into the incident. From the preliminary investigation, it was found that the passengers were travelling on the footboard [of the trains]," added Nila. According to officials, the incident occurred near Mumbra station, when two suburban CR trains on the fast lines - Kasara-CSMT and CSMT-Karjat - were cruising at 75 kmph on a curve and crossed each other. Trains on CR's fast lines do not halt at Mumbra. A senior CR official, speaking on condition of anonymity, said they are looking at all possibilities. "The victims have bruises on their legs and hands. It is still unclear what hit them or the probable reason behind their falling off the train. Shoulder bags have also been found at the site, so we are looking at the possibility of people hanging by the footboard wearing bags brushing against commuters travelling in the train coming from the opposite direction." CR officials were seen measuring the distance between the two rail lines, as people have claimed that the two trains that crossed each other had touched. However, this is unlikely, said the senior CR official quoted earlier. "There were scratches on the coaches. However, if the coaches had hit each other, at that speed, there would have been a derailment." CR is also looking at the possibility of the involvement of the so-called fatka gang, the official said. Members of the notorious gang target passengers standing on the footboard of local trains by attacking their hands with sticks, causing them to drop their phones. "There is another allegation that there was an argument that led to a fight in one of the coaches, which led to the people falling off," the official added. Passengers who witnessed the incident recounted the horror, with some claiming they were saved from falling off by other passengers. Deepak Shirsat, 23, who was in one of the trains, said, "I boarded this CSMT-bound train at Shahad. After the Diva station, the footboard was overcrowded as passengers began pushing each other to make sure they get to alight at Thane. I was distracted on my phone, and suddenly the train tilted slightly. We held onto the handles, but in a flash, I saw two to three people fall off right in front of me. Someone behind grabbed me just in time. We tried to pull the emergency chain, but the train didn't stop." Rescue efforts were swift, led by the Thane Government Railway Police (GRP) and commuters. "When we got off at Thane, we rushed back to Mumbra along with the railway police staff. We helped carry the injured passengers into a tempo rickshaw and took them to Chhatrapati Shivaji Maharaj Hospital in Kalwa. I keep thinking - if it had been raining, maybe the doors would have been closed and these fellow commuters would have been safe," added Shirsat....