The Assam Tribune. 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. Six coaches of the Kolkata–Sairang Express derailed at Digaru railway station in Assam early Wednesday. Officials are investigating and have dispatched senior staff to the.