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. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])