Missouri, Kansas & Texas Railroad (Katy) DS4-4-1000 puzzle, based on an original photo by Paul F. De Luca (photo copyright Paul F. De Luca -- used with permission). Photographed at Dallas, Texas, July 17, 1985.
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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.