by Kyle Yunker
Canadian National Railway SD70M-2 puzzle, based on an original photo by Kyle Yunker (photo copyright Kyle Yunker -- used with permission). Photographed at Emerson, Georgia, May 21, 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.