The "Dyckman-Hillside Substation", also known as "Substation 17", is an historic electrical substation located at 127-129 Hillside Avenue between Sickles Street and Nagle Avenue, near the Dyckman Street station of the IRT Broadway-Seventh Avenue line, in the Washington Heights neighborhood of Manhattan, New York City. It was one of eight substations constructed by the Interborough Rapid Transit Company in 1904-05, and was designed in the Beaux-Arts style.