Atchison, Topeka & Santa Fe (ATSF) SD45 puzzle, based on an original photo by Joe Blackwell (photo copyright Joe Blackwell -- used with permission). Photographed at Woodford, California, May, 1974.
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The "Easy" version of the puzzle has about 100 pieces, "Medium" has about 200 pieces, "Hard" is about 300 pieces. For the Online puzzles, see the Online Puzzle Tips.