by E. Clark
CSX Transportation (CSXT) GP40-2 puzzle, based on an original photo by E. Clark (photo copyright E. Clark -- used with permission). Photographed at McGonigle, Ohio, July 9, 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.