The Main Line of Public Works was a significant transportation project in the early 19th century, primarily in Pennsylvania. It was designed to connect the eastern cities of Philadelphia and Pittsburgh through a series of canals, railroads, and roads, facilitating trade and travel across the state. Constructed between 1826 and 1854, the Main Line played a crucial role in the economic development of Pennsylvania. It helped transport goods and people more efficiently, contributing to the growth of industries and communities along its route. The project marked an important step in the evolution of American infrastructure.