by Colin Arnot
Canadian Pacific Railway SD60 puzzle, based on an original photo by Colin Arnot (photo copyright Colin Arnot -- used with permission). Photographed at Scotford, Alberta, January 1, 2020.
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.