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A Thai woman carries her daughter on her shoulders while wading through a flooded street in Bangkok, Thailand, Saturday, Nov. 5, 2011. Floodwaters lapped Bangkok's largest outdoor market Saturday as officials warned that there were no major barriers between the water and the heart of the Thai capital, less than 6 miles (10 kilometers) away. (AP Photo/Altaf Qadri)

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.