by John Shine
BNSF Railway SD40-2 puzzle, based on an original photo by John Shine (photo copyright John Shine -- used with permission). Photographed at Parachute, Colorado, October 20, 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.