How did railroad grants both reflect and promote national economic growth?

Railroads were a better way for fast migration of people, food and manufactured goods across country. , The movement of goods, especially in a large countries , was limited by weather, speed, size and availability of water with the help of railroads.The railroads dropped the price of shipping significantly because of their ability to move large amounts of goods, providing industry leaders with more capital that could be applied to constructing factories.

Of the revolutions of 1848.