Building a national market
Reliable long-distance transportation allowed producers to reach customers far beyond local markets. That encouraged larger-scale farming, mining, manufacturing, warehousing, and distribution.
Capital and industry
Railroad construction required enormous investment in land, bridges, tunnels, rails, locomotives, rolling stock, terminals, and communications. The industry stimulated demand for coal, iron, steel, timber, machinery, and finance.
Reducing the barrier of distance
Transportation does not eliminate distance, but faster and more predictable movement changes what can be profitably produced and sold. Railroads helped integrate regional economies into a national system.
The economy today
Modern freight rail is one component of a larger transportation network including trucks, barges, pipelines, ports, and air cargo. Its greatest strengths remain high-capacity long-distance movement and connections to major industrial and trade corridors.