Unidentified track tunnel.
Unidentified tunnel.
Northern section of land tunnel.
Unidentified railroad tracks.
Unidentified subway tracks.
Unidentified street.
Unidentified elevated railroad platform.
Southbound express tunnel.
Sea Beach Line right-of-way at 21st Avenue.
Sea Beach Line at 19th Avenue.
Sea Beach Line, 11th Avenue.
Sea Beach Line, Avenue R.
Sea Beach Line and Long Island Railroad cut, north to 9th Avenue.
Sea Beach Line and Long Island Railroad cut, northwest to near 11th Avenue.
Sea Beach Line and Long Island Railroad cut, north near 11th Avenue.
Central Avenue bridge.
Subway tunnel construction at Lexington Avenue and 97th Street.
Sea Beach Line, 18th Avenue, with building support.
Park Avenue.