A video from inside the Kolkata-Sairang Express locomotive captures the moments before its derailment near Guwahati. The driver is heard reporting a red signal and a possible emergency system failure. The coaches derailed at Digaru near Assam's Guwahati on Wednesday morning, officials said. A video recorded inside the locomotive of the Kolkata-Sairang Express moments before its derailment in Assam has surfaced. The footage reportedly captures the train driver saying that the.