by Steve Hardin
Canadian National Railway SD70M-2 puzzle, based on an original photo by Steve Hardin (photo copyright Steve Hardin -- used with permission). Photographed at Cartersville, Georgia, April 26, 2019.
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.