by Adam Weddle
Norfolk Southern AC44C6M puzzle, based on an original photo by Adam Weddle (photo copyright Adam Weddle -- used with permission). Photographed at Bluefield, West Virginia, October 4, 2016.
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.