Edward S. Curtis took most of the photos he used in his monumental work "The North American Indian" about a hundred years ago - probably pretty much all in the early 1900's through WWI. There's been quite a bit of controversy about how accurate they are as anthropology. Curtis wanted to document Indians in their pre-contact state, and tended to try to accomplish this by airbrushing out anachronistic items like alarm clocks, and by traveling with a wardrobe of clothing to dress his photo subjects in - so sometimes the same blouse or headgear appears with several persons.
Edward S. Curtis may be the better known of the two brothers, but Asahel Curtis actually did some railroad photography. Not, alas, narrow gauge, but he documented work on the Copper River & Northwestern in Alaska, and the western end of the Milwaukee's Pacific extension. There is a wealth of Asahel Curtis material at the Washington State Historical Society in Tacoma.
Beautiful work, Roger. I must say the red cars look much better in black and white.
Charlie Mutschler
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