铁路投资是前所未有的投资（此图表采用对数刻度！）
保罗·格雷厄姆指出，铁路投资在历史上是独一无二的，其图表采用对数刻度展示了这一投资的非凡规模。铁路建设对美国经济发展产生了深远影响，其投资规模至今仍无与伦比。
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