by Frank Orona
CSX Transportation (CSXT) SD40-3 puzzle, based on an original photo by Frank Orona (photo copyright Frank Orona -- used with permission). Photographed at Opelika, Alabama, October 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.