Railroad expansion refers to the growth and development of railway networks, particularly in the 19th century. This expansion allowed for faster transportation of goods and people across vast distances, significantly impacting economies and societies. Key projects, such as the Transcontinental Railroad in the United States, connected the east and west coasts, facilitating trade and migration. The expansion of railroads also led to the establishment of new towns and industries along the routes. It played a crucial role in the Industrial Revolution, as it enabled the efficient movement of raw materials and finished products. Overall, railroad expansion transformed transportation and contributed to national growth.