Canadian National Railway SD70M-2 puzzle, based on an original photo by Alastair Poll (photo copyright Alastair Poll -- used with permission). Photographed at Bellingham, Washington, August 23, 2020.
Click here for more information about this photograph
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.