Capitol, North O Street and South Washington Railway

The sixth and final company to start during the horsecar era, it operated on a loop, or "belt," around downtown and the National Mall.

The company was purchased and absorbed by the Anacostia and Potomac River Railroad after a failed attempt to convert to a system that used compressed air for motive power.

[1][2][3] The Capitol, North O Street and South Washington went through several changes after its initial startup.

On June 24, 1898, the Anacostia and Potomac River Railroad purchased and absorbed the Belt Railway.

[2] In 1899, the company's cars were equipped with the city's standard underground power system.