来往于伦敦和这条线上其他城市间的旅程时间将会缩短；南北铁路线主线之一的线路运营能力不足问题也将避免。
Journey times between London and other cities will fall; a capacity shortfall on one of the main north-south rail routes will be avoided.
美国铁路直到十九世纪八十年代才采用统一的轨幅，这就使得南北方铁路间的互连不但非常复杂而且缓慢、昂贵。
Railroads in the United States did not settle on a uniform gauge until the 1880s, making interconnections between lines in the North and South complicated, slow, and expensive.
美国1861年-1865间发生的南北内战时间尚不算久远，足以编入文化记忆。
The American war of 1861-65 is recent enough to be embedded still in cultural memory.
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