The Dyckman-Hillside Substation, also known as Substation 17, is a historic

electrical substation A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and ...

located at 127-129 Hillside Avenue between Sickles Street and Nagle Avenue, near the Dyckman Street station of the

New York City Subway The New York City Subway is a rapid transit system owned by the government of New York City and leased to the New York City Transit Authority, an affiliate agency of the state-run Metropolitan Transportation Authority (MTA). Opened on October 2 ...

's IRT Broadway–Seventh Avenue Line, in Inwood,

Manhattan Manhattan (), known regionally as the City, is the most densely populated and geographically smallest of the five boroughs of New York City. The borough is also coextensive with New York County, one of the original counties of the U.S. state ...

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

. It was one of eight substations constructed by the Interborough Rapid Transit Company in 1904–05. The substation is a two-story, freestanding masonry building in the Beaux-Arts style. It features a hipped roof, tower-like projections, scrolled wrought iron brackets, and

terra cotta Terracotta, terra cotta, or terra-cotta (; ; ), in its material sense as an earthenware substrate, is a clay-based unglazed or glazed ceramic where the fired body is porous. In applied art, craft, construction, and architecture, terracotta ...

decorative details. ''See also:'' It was listed on the

National Register of Historic Places The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...

in 2006.

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* Buildings and structures on the National Register of Historic Places in Manhattan Industrial buildings and structures on the National Register of Historic Places in New York City Beaux-Arts architecture in New York City Energy infrastructure completed in 1905 Industrial buildings and structures in Manhattan Inwood, Manhattan New York City Subway infrastructure 1905 establishments in New York City {{Manhattan-struct-stub