The Pennsylvania Railroad (PRR) was one of the largest and most influential railroads in the United States, operating from the 19th century until the mid-20th century. Founded in 1846, it played a crucial role in the development of the American transportation network, connecting major cities like Philadelphia, Pittsburgh, and New York City. At its peak, the Pennsylvania Railroad was known for its extensive network of routes and innovative technologies, including the use of electric trains in urban areas. The company faced challenges in the latter half of the 20th century, leading to its merger with Penn Central Transportation Company in 1968.