Philadelphia, Wilmington and Baltimore Railroad
The Philadelphia, Wilmington and Baltimore Railroad (PW&B) was an American railroad that operated from 1836 to 1881. Formed as a result of the merger of four small lines dating from the earliest days of American railroading in the late 1820s and early 1830s, it was purchased by the Pennsylvania Railroad (PRR) in 1881, becoming part of their main line in 1902.