Union Pacific AC4400CW puzzle, based on an original photo by Joel Hinkhouse (photo copyright Joel Hinkhouse -- used with permission). Photographed at Yarmony, Colorado, March 6, 2006.
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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.