Baltimore and Philadelphia Railroad

The Baltimore and Philadelphia Railroad (reporting mark B&P) was a railroad line in the United States, built by the Baltimore and Ohio Railroad (B&O) from Philadelphia, Pennsylvania, to the Maryland-Delaware state line, where it connected with the B&O's Philadelphia Branch to reach Baltimore, Maryland. It was built in the 1880s after the B&O lost access to its previous route to Philadelphia, the Philadelphia, Wilmington and Baltimore Railroad (PW&B).

Source: Wikipedia — Baltimore and Philadelphia Railroad (CC BY-SA 4.0)