by Joe Vittitoe
Norfolk Southern SD40-2 puzzle, based on an original photo by Joe Vittitoe (photo copyright Joe Vittitoe -- used with permission). Photographed at Emory Gap, Tennessee, November 3, 2018.
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.