Six coaches and the locomotive of the Kolkata-Sairang Express derailed near Digaru on the outskirts of Guwahati, Assam. Further details are awaited. 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. A major train accident was reported in Assam this morning after seven coaches of the Kolkata-Sairang Express derailed near Digaru, on the outskirts of Guwahati.