Map of the Delaware and Bound Brook Railroad
The National Railway or National Air Line Railroad was a planned air-line railroad between New York City and Washington, D.C. in the United States around 1870. Part of it was eventually built from New York City to Philadelphia by the Delaware and Bound Brook Railroad and the Delaware River Branch of the North Pennsylvania Railroad, leased by the Philadelphia and Reading Railway, in 1879, and becoming its New York Branch. The line was intended to provide an alternate to the various monopolies that existed along the route, specifically the United New Jersey Railroad and Canal Companies and their Camden and Amboy Railroad, and as such had a long struggle to be built.