 The PB&W main line is now part of the Northeast Corridor, owned by Amtrak.The railroad was formed in 1902 when the Pennsylvania Railroad merged two of its southern subsidiaries, the Philadelphia, Wilmington and Baltimore Railroad and the Baltimore and Potomac Railroad.In 1907, the PB&W became a co-owner of the new Washington Terminal Company, which operated the new Washington Union Station, the marble structure dubbed the "Transportation Temple of America".