Transcontinental Railroad: A transcontinental railroad is a railway line that spans across an entire continent, linking one coast with another. It facilitates transportation over vast distances.
Infrastructure: Infrastructure refers to the basic physical structures needed for society's operation and development. In the case of railroads, infrastructure includes tracks, stations, bridges, etc.
Transportation Revolution: The transportation revolution describes the period when there were significant advancements in transportation methods (such as railroads) that transformed how goods and people moved across long distances.