Burlington Northern Railroad SD60M puzzle, based on an original photo by Paul F. De Luca (photo copyright Paul F. De Luca -- used with permission). Photographed at Lincoln, Nebraska, March 15, 1994.
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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.