BEIJING/ HONG KONG Aug 31 (Reuters) - China issued its highest typhoon warning on Thursday as Super Typhoon Saola, packing winds of more than 200 kph (125 mph), headed towards the southeastern coastline, threatening Hong Kong and other major manufacturing hubs in nearby Guangdong province. Chinese forecasters issued a typhoon red warning at 6 a.m. (2200 GMT). As Saola approached, Guangdong's Shenzhen city said it would upgrade the typhoon warning level to yellow - the second lowest - at 6 p.m. on Thursday, and suspend classes at nurseries, kindergartens, primary and secondary schools. China Railway has suspended several major train lines and Shanghai halted trains heading to Guangdong, according to local media. Reporting by Bernard Orr, Ethan Wang，David Kirton and Shanghai newsroom, Farah Master and Twinnie Siu in Hong Kong; Editing by Lincoln FeastOur Standards: The Thomson Reuters Trust Principles.

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Persons: Saola, Hong Kong's, Shenzhen's Baoan, Downpours, Bernard Orr, Ethan Wang ， David Kirton, Farah, Twinnie Siu, Lincoln Organizations: Meteorological Centre, Supermarkets, Kong's, China Southern Power Grid, China Railway, Thomson Locations: BEIJING, HONG KONG, China, Hong Kong, Guangdong, Guangdong province, Huilai County, Wan Chai district, Shenzhen, Shenzhen's, Shanghai, Fujian