Donner Lake, Tunnels No. 7 and 8 from Summit Tunnel, eastern summit in distance
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East portal of summit tunnel. Western summit. Length 1,660 feet
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Section of Penn. R. R. tunnel under the Hudson River at N. Y. City, exhibited at World's Fair, St. Louis, Mo., 1904. Diameter 21 feet
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Bend of the Weber, Upper Weber Kanyon, near Tunnel No. Three, looking east.
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Bend of the Weber, Upper Weber Kanyon, near Tunnel no. Three looking, east.
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Tunnel No. 3, Weber Canon. U.P.R.R.
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Tunnel No. 3, Weber [River].
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Tunnel No. 3 and Weber River.
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West End Tunnel No. 3.
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Tunnel near Devil's Gate.
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Railroad tunnel.
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Black Rock Tunnel, near Phoenixville.
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Tunnel near Greensburg.
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Columbia Tunnel.
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Allegheny Tunnel.
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Allegheny Tunnel.
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Blairsville Tunnel.
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Carr’s Tunnel.
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The Allegheny Tunnel.
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The Allegheny Tunnel.
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The Allegheny Tunnel.
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Allegheny Tunnel.
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Allegheny Tunnel.
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Spruce Creek tunnel.
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Spruce Creek tunnel.
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Columbia Tunnel.
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Railroad tunnel and tracks through mountain.
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The entrance of the Shawangunk Tunnel, on the east side.
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The entrance of the Shawangunk Tunnel, on the west side.
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The Breckneck Tunnel.
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