CSX Transportation (CSXT) AC6000CW puzzle, based on an original photo by Kerry Douglas (photo copyright Kerry Douglas -- used with permission). Photographed at Stevenson, Alabama, February 5, 2013.
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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.