by Frank Orona
BNSF Railway SD70ACe puzzle, based on an original photo by Frank Orona (photo copyright Frank Orona -- used with permission). Photographed at Opelika, Alabama, December 16, 2017.
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.