by Tom Farence
BNSF Railway SD40-2 puzzle, based on an original photo by Tom Farence (photo copyright Tom Farence -- used with permission). Photographed at Colona, Illinois, November, 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.