[McAdoo Tunnel.]

[Constructing the McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

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

McAdoo Tunnel under North River, New York

[William McAdoo.]

[Tunnel construction.]

[Tunnel construction.]

[North tunnel shield.]

[Cheering parade of delegates after nominating McAdoo for president.]

[Holland Tunnel.]

Southbound express tunnel.

[Holland Tunnel.]

Queensboro Tunnel.

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

Midtown Tunnel under Hudson River, April 24, 1935

Queensboro Tunnel.