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美国1776年宣布独立后不断向西扩张,在1846～1853年,通过武装夺取、渗透和“购买”等手段将西部国界一直推进到太平洋沿岸,达到现定版图。为开发西部,1851～1910年60年间,美国掀起了铁路建设高潮,年均修建铁路6000多km,其间的1887年就修建铁路20619km,创铁路建设史上的最高纪录。1916年,美国铁路营业里程达到美国历史的最高水平,约为408745km,约占当时世界铁路总长度的39%,形成全国四通八达的庞大铁路网。
After the United States declared independence in 1776, it continued to expand westward. From 1846 to 1853, the western frontiers of the western China had been pushed to the Pacific Rim by means of armed seizure, infiltration and “purchase” to reach the now established territory. For the development of the west, from 1851 to 1960, the United States set off a climax of railway construction with an average annual construction of more than 6,000 km of railways. In 1887, it built 20,619 km of railways and set a record high in railway construction. In 1916, the U.S. railway business mileage reached the highest level in U.S. history, about 408745km, accounting for about 39% of the total length of the world’s railway at that time, forming a huge railway network extending in all directions across the country.