Reading & Northern 4-6-2 puzzle, based on an original photo by Robert L. Sartain (photo copyright Robert L. Sartain -- used with permission). Photographed at Jim Thorpe, Pennsylvania, August 22, 2020.
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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.