by Nick Hart
Canadian National Railway GP40-2LW puzzle, based on an original photo by Nick Hart (photo copyright Nick Hart -- used with permission). Photographed at Willow Springs, Illinois, September 30, 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.