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SP&S Cape Horn tunnel at east portal showing construction crew laying track, November 16, 1907. Photo by C.P. Stanray.

SP&S Cape Horn tunnel at east portal looking down at first train, November 15, 1907. Photo by C.P. Stanyan.

A view of construction at the west portal of the SP&S Cape Horn tunnel, November 14, 1907. Photo by C.P. Stanyan.

SP&S Cape Horn tunnel; color postcard image, March 7, 1910.

SP&S Cape Horn tunnel; color postcard image, February 14, 1910.

SP&S Cape Horn tunnel looking at east portal, 1909. Photo by Fred H. Kiser.

A view of SP&S bridge under construction by the Snake River, undated.

SP&S Columbia River Bridge piers; pier installation at Oregon Slough, November 7, 1907. This is a postcard image.

A view of SP&S Columbia River Bridge piers, Shaw Island (now Hayden Island), March 21, 1908. This is a postcard image.

SP&S Columbia River Bridge piers; view of bridge piers from Oregon Slough , April 21, 1907. This is a postcard image.