The Manhattan Railway Company photography collection spans the years 1900-1905 and documents the stages of a modernization project that the company begain in 1899 on its Second, Third, Sixth, and Ninth Avenue elevated lines. Highlights include images of the construction of substation 4 in Harlem, the aftermath of a fire in the Lower East Side, and the interior of the 74th Street powerhouse, including images of rotary converters, transformers, and other machinery captured in detail.