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Residents stand as water from the swollen Chao Phraya River flows through a shopping center, located on its bank, in Bangkok, Thailand, Saturday, Oct. 29, 2011. (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.