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. A viral video shows the loco pilot of the Kolkata-Sairang Express that derailed early Wednesday morning, struggling to stop the train. The coaches derailed at Digaru near Assam's Guwahati on Wednesday morning, officials said.