On 12th October 2010, nearly 2,000 passengers were trapped briefly when a glitch stalled a Metro train underground during the evening rush hour which led to a cascading effect disrupting services in entire north Kolkata. The Dum Dum-bound train from Girish Park, overcrowded because of the puja rush, came to a halt due to a glitch in the tunnel before entering Sobhabazar station and Metro Rail employees had to carry out an emergency evacuation of the 2000 passengers on board. Angry passengers went on the rampage at the Sobhabazar station and ransacked the ticket counter with the police making some arrests. As a result, services between Dum Dum in the north and Park Street in central Kolkata remained stalled for a long time. Metro services were normal up to Kavi Subhas station in the south. The disruption of the services led to further trouble with passengers demonstrating at Metro stations.
And only after one week on 19th October 2010, two coaches of a metro train derailed near Central station during rush hour in Kolkata at the morning, triggering panic among hundreds of office-goers and disrupting services. The cause of the derailment, which occurred in the morning, is yet to be ascertained, a departmental inquiry has been ordered into the derailment. Though no passenger was injured, some people complained of uneasiness as lights went off inside the