Being of Chinese-American descent myself, I am particularly interested in the Chinese Railroad workers of the mid/late 19th century. Although my family line was on the East Coast, the time period roughly coincides with the insurge of Chinese Immigrants to the west, and I wonder what kind of opposition my great-grandfather might have faced; the Chinese Exclusion Act wasn't legally repealed until 1943.
Here are some photographs of Chinese laborers (mostly rail).
Chinese America Placer Miner, circa 1860s-70s. Courtesy of Nevada Historical Society. Found at On Gold Mountain.
Surviving Central Pacific Chinament, Wong Food, Lee Chao, Ging Cui. Unidentified Artist P1967.727 gelatin silver print, 1919. Courtesy of Amon Carter Museum, Fort Worth, Texas. Found at On Gold Mountain.
Photo by Roy Graves, found at Bay Radical.
found at Michigan State University.
found at Golden Gate Model Railroaders, Inc.
above two images from Library of Archives Canada, found at Rocky Railroad High.
found at GoldSea.
found at BakitWhy.