What railroad made it possible to provide a new source of transportation at a rate that was virtually unheard of in the US?

The Transcontinental Railroad made it possible to provide a new source of transportation at an unprecedented rate in the United States. Completed in 1869, it connected the eastern and western regions of the country, significantly reducing travel time and costs. This monumental achievement facilitated commerce, migration, and the movement of goods across vast distances, fundamentally transforming the American economy and society.