cars piling on top of each other. The damage was so severe that the cars never returned to service. Passengers had been unloaded prior to the crash while the two KCR employees escaped significant injury. However, the accident caused train services to be suspended for the rest of the day and the incident spurred a series of public outcries concerning railway safety. The KCR determined that the accident occurred due to human error and not any system failure, suspended the driver, and changed procedures such that drivers were required to operate the train from the front carriage while shunting at Sheung Shui. In 1988, there were numerous separate incidents of Chinese freight trains derailing on the railway. On 28 May, a locomotive and a goods wagon jumped the tracks near Fo Tan station, blocking the line. Services were temporarily detoured through Racecourse station. On 4 June, a wagon derailed near University station, again blocking the line. Coupled with a lorry accident in the Lion Rock Tunnel the same day, Kowloon and Sha Tin were thrown into "traffic chaos". On 2 July, another goods wagon derailed on a siding in Lo Wu after arriving from Shenzhen. As it was being hauled to the Fo Tan workshop at 1:44 am the following day for examination, it derailed again, though damage to the tracks was minor. Nobody was injured in the above incidents. The problems were attributed to uneven loading of the freight trains, sharply curved trackage "unideal" for the freight wagons, and the structural characteristics of the Chinese trains. In response, KCRC carried out track improvements and liaised with the Guangzhou Railway Administration. At the time, the KCRC handled 6.25 million freight wagons per year, so the derailments were relatively isolated occurrences. In the early morning of 31 May 1989, diesel locomotive L57 collided head-on with locomotive L56 at Mongkok (now Mong Kok East) station, causing injuries to four KCR staff. Three employees in L57 were taking the locomotive from Kowloon (now Hung Hom) station to Fo Tan for repairs. The locomotive ran a red signal and struck the stationary L56 while traveling at about 50 km/h. Chan Yau-keung, a KCR Corporation construction supervisor, was critically injured and died on 8 June at Kwong Wah Hospital. He had been standing between the driver Ko Yuk-ching and co-driver Lee Kam-ming, both of whom were seated. Ko was a qualified driver while Lee, an