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A traktor ferries stranded people along flooded streets at the Lad Phrao district in Bangkok, Thailand, Saturday, Nov. 5, 2011. Thailand's record floods continued to creep towards inner Bangkok. (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.