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Interborough rapid transit: the New York subway, its construction and equipment
Rare Book Division, The New York Public Library. "Main line, piping and wiring for block and interlocking system, showing junction box on column." The New York Public Library Digital Collections. 1904. https://old-digitalcollections.nypl.org/items/510d47dc-9bbb-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "Main line, piping and wiring for block and interlocking system, showing junction box on column." New York Public Library Digital Collections. Accessed October 1, 2026. https://old-digitalcollections.nypl.org/items/510d47dc-9bbb-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1904). Main line, piping and wiring for block and interlocking system, showing junction box on column. Retrieved from https://old-digitalcollections.nypl.org/items/510d47dc-9bbb-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47dc-9bbb-a3d9-e040-e00a18064a99 | title=
(still image)
Main line, piping and wiring for block and interlocking system, showing junction box on column., (1904)
|author=Digital Collections, The New York Public Library |accessdate=October 1, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>