The Oakland, San Leandro and Haywards Electric Railway (OSL&H) was an electric street railroad in the East Bay of California. It connected Haywards to Oakland along the 14th Street and Mission Boulevard. Tracks were laid with a narrow gauge of 3 feet 8 inches (1,118 mm) using 35-pound rails, with operations beginning in May 1892. Transfers were made available to the Highland Park and Fruit Vale Railroad Company's cars, and to the cars of the Central Avenue Railway streetcar line. Oakland's terminus was extended to First and Washington the following March. A new company was established to build the 23rd Avenue branch, which would be absorbed into the OSL&H in 1894. Between September 1901 and May 1906 the California Railway line to Leona Heights was dual gauged to allow interchange with the OS&H. By 1907, the line had been converted to standard gauge except for one mile of tracks leading into downtown Haywards, which was similarly converted the following year.