by Bill Bores
Norfolk Southern SD40E puzzle, based on an original photo by Bill Bores (photo copyright Bill Bores -- used with permission). Photographed at Wall, Pennsylvania, November 18, 2016.
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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.