Ferrocarril General Roca U18C puzzle, based on an original photo by Julio Pastine (photo copyright Julio Pastine -- used with permission). Photographed at Ciudad de Buenos Aires, Argentina, January 27, 1989.
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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.