Canadian National Railway SD50 puzzle, based on an original photo by northamericabyrail.info (photo copyright northamericabyrail.info -- used with permission). Photographed at Dundas, Ontario, March 23, 2008.
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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.