[Tunnel construction.]

[Holland Tunnel.]

Midtown Tunnel under Hudson River, April 24, 1935

[Tunnel construction.]

[McAdoo Tunnel.]

Building the McAdoo Tunnel, Under the Hudson River, New York.

[McAdoo Tunnel.]

[Holland Tunnel.]

Queensboro Tunnel.

[Holland Tunnel.]

Queensboro Tunnel.

[Constructing the McAdoo Tunnel.]

[Construction of the Pennsylvania Railroad tunnels under the Hudson.]

Original Exhibits of Rapid Transit Subway Construction Company, Plaintiff [Excavating a tunnel; subway construction.]

Rondout Pressure Tunnel Showing Partial and Total Concrete Lining [Catskill System.]

[Unloading ring from truck.]

[Holland Tunnel.]

Shaft No. 4, Steinway Tunnel.

[McAdoo Tunnel.]

Southbound express tunnel.