VARANASI: Derailment of two coaches of Manduadih-Chapra passenger train at Cantonment railway station on Friday brought railway officials on their toes. However, no casualty or injury was caused as the train was moving at a slow speed. The incident disrupted train movement for about two hours.The Chauri Chaura Express had also derailed at the same place in the wee hours on Thursday. A joint investigating team of NER (Varanasi) and NR (Lucknow) are investigating the matter.According to AK Pandey, station manager, Cantt, two coaches of a 10-coach passenger train derailed after reaching the yard of the Cantt station. The cause of the derailment was not known and investigation was being conducted to find out the reason for derailment. No casualty or injury was reported and the train moved with eight coaches after the incident, he added.