by John Burke
Pan Am Railways SD40-2 puzzle, based on an original photo by John Burke (photo copyright John Burke -- used with permission). Photographed at East Kingston, New Hampshire, November 14, 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.