by Josh Putman
Burlington Northern Santa Fe SD40-2 puzzle, based on an original photo by Josh Putman (photo copyright Josh Putman -- used with permission). Photographed at Bigbee, Mississippi, February 21, 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.