Young girls participating in the parade for the opening of the Willis Avenue Bridge, New York City, undated [1901].

West 14th Street, looking west from Fifth Avenue, New York City, August 16, 1902. Sixth Avenue elevated station visible.

West 14th Street, looking west from Fifth Avenue, New York City, 1902. Sixth Avenue elevated station visible.

View of the Jerome Avenue IRT line looking south from 170th Street to the 167th Street station, Bronx, undated [ca. August 1918]. Probably photographed for the Interborough Rapid Transit Company.

View of a maintenance car on the Sixth Ave El line, looking north from between 29th and 30th Street, undated. Copy photograph dated May 24, 1940.

View of a Sixth Avenue El train looking north from W. 8th Street, 1885. Copy photograph dated May 24, 1940.

View of W. 42nd Street from the Ninth Avenue El station, New York City, undated (ca. 1900-1910).

View of Greeley Square, with the elevated train station, a statue of Horace Greeley, and a hansom cab in the foreground, New York City, July 18, 1896.

View looking west from the el station at 233rd Street and White Plains Road, Bronx, April 28, 1916. Photographed for Joseph P. Day.

View looking east from the el station at 233rd Street and White Plains Road, Bronx, April 28, 1916. Photographed for Joseph P. Day.

Van Cortlandt Park crowds at 242nd Street subway station, Bronx, June 7, 1914. Photographed for Joseph P. Day.

Unidentified young girls taking part in the ceremonies for the opening of the Willis Avenue Bridge, New York City, 1901.

Unidentified upper Manhattan elevated subway station, undated (ca. 1916).

Unidentified upper Manhattan elevated subway station, undated (ca. 1916).

Unidentified stretch of train / trolley tracks, [Bronx?], undated [ca. May 1916].

Unidentified railroad tracks [Brooklyn Rapid Transit?], July 30, 1940.

Unidentified railroad tracks [Brooklyn Rapid Transit 9?], July 30, 1940.

Unidentified railroad station [Brooklyn Rapid Transit 12?], July 30, 1940.

Unidentified location [probably the Sixth Avenue El, Manhattan], with workman using a cutting torch on tracks, undated [c. 1937-1941].

Unidentified elevated trains and tracks, Bronx (?), undated (ca. July-August 1918).

Unidentified elevated trains and tracks, Bronx (?), undated (ca. July-August 1918).

Unidentified elevated trains and tracks, Bronx (?), undated (ca. July-August 1918).

Unidentified elevated trains and tracks, Bronx (?), undated (ca. July-August 1918).

Unidentified elevated train station under construction, [Bronx?], undated [ca. May 1916].