tunnel 34

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Ptarmigan Tunnel

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St. Clair River Tunnel

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Westmoreland Tunnel

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Stumphouse Tunnel Complex

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Cumberland Mountain Tunnel

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Chattanooga, Harrison, Geor...

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Union Canal Tunnel

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Jenson Tunnel

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Sinking last tubular sectio...

1900

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Sinking last tubular sectio...

1910

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Entrance to St. Clair tunne...

1900

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Detroit River tunnel, Detro...

1910

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Approach to the Detroit Riv...

1910

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St. Clair tunnel, Port Huro...

1900

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West portal, Hoosac Tunnel,...

1908

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East portal, Hoosac Tunnel,...

1908

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Ste. Claire i.e. St. Clair ...

1900

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East portal, Hoosac Tunnel,...

1900

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West portal, Hoosac Tunnel,...

1900

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Nay Aug tunnel, Scranton, Pa.

1890