Thousands of commuters were stranded during morning rush hour yesterday, when a Light Rail train jumped its tracks in Tuen Mun, causing delays for two hours. Rail traffic on four routes passing through five common stations between Siu Hong and Hung Shui Kiu was paralysed after the derailment - the first incident of its kind on the Light Rail network. The route 505 train was approaching Siu Hong station at 7.50am when its front wheels jumped the track, a spokesman for Kowloon-Canton Railway Corporation said. The corporation estimated that about 15,000 passengers were affected. There was chaos at the various stations as agitated commuters waited to get to work. Police were sent to maintain order. Only one person was injured - a woman who suffered minor chest injuries and was sent to Tuen Mun Hospital for treatment before later being discharged. Although news of the accident was announced at the various stations, commuters complained that the information came too late. One caller to a radio show said: 'Nobody informed us of the reason for the delay.' Another caller claimed: 'I have been sacked because I couldn't get to the office on time, and all they [the KCRC] say to me is sorry.' Sarah Liao Sau-tung, the Secretary for Environment, Transport and Works, said she would ask the KCRC to submit a report to the government. 'We want them to find out what the cause of the incident is and how it can be prevented from happening in future,' she said. The KCRC sent 20 buses to shuttle commuters to Hung Tin Road so they could catch other buses or taxis. The train service was back to normal at 10.20am. A spokesman for the KCRC apologised to the public and said full refunds would be given to commuters.