by Tom Binger
Canadian Pacific Railway SD70ACU puzzle, based on an original photo by Tom Binger (photo copyright Tom Binger -- used with permission). Photographed at Mayfield, Kentucky, November 17, 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.