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美国衣阿华州际铁路有限公司（IowaInterstateRailroadLtd）向本国罗克韦尔国际公司订购了一种名为“哨兵”（Sentinel）的机车监视系统。该系统是由罗克韦尔国际公司的铁路电子产品部研制并于1994年1月推出的。1994年7月，美国联合太平洋铁路率先订购了这种系统，衣阿华州际铁
Iowa Interstate Railroad Ltd ordered a locomotive surveillance system called Sentinel from its Rockwell International company. The system was developed by Rockwell International’s Rail Electronics Division and launched in January 1994. In July 1994, United Pacific Pacific Rail took the lead in ordering such a system. The Iowa Interstate