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名前：Cedric日付：2015/01/01 14:12:34
I work for a publishers maxalt 10 mg Congress in 2008 approved a rail-safety law that gave commuter and freight railroads until the end of 2015 to install the technology, known as positive train control. PTC is aimed at preventing human error â the cause of about 40 percent of train accidents. But the systems are expensive and complicated. Railroads are trying to push back the installation deadline another five to seven years.
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