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A Thai worker sleeps on top of a hand cart to keep him dry from floodwaters near the swollen Chao Phraya River in Bangkok, Thailand, Saturday, Oct. 29, 2011. The complex network of flood defenses erected to shield Thailand's capital from the country's worst floods in nearly 60 years was put to the test Saturday as coastal high tides hit their peak. (AP Photo/Aaron Favila)

Floods threaten Bangkok trains

Advancing pools of filthy water threatened the Thai capital's subway system Monday and surrounded the emergency headquarters set up to deal with flooding that has claimed more than 500 lives nationwide.