Open Magazine. NFR General Manager Vivek Khare reaches accident site, passengers shifted to an alternative train after the. Several coaches of the Kolkata-Sairang Express derailed at Digaru railway station today after a speed control failure. Follow The Hindu for more updates. Footage recorded inside the Kolkata-Sairang Express locomotive captures the driver reporting a red signal and a non-responsive emergency system before the train hits barricades and derails.