This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Bowling Green NYCS signal. Bowling Green IRT Lexington Avenue Line Bowling Green station uptown track New York City Subway Signal manufactured by Union Switch Signal Co Own Caseyjonz Bowling Green IRT Lexington Avenue Line New York City Subway signals Union Switch and Signal Vertical color light signals