by Peter Wright
BNSF Railway ES44C4 puzzle, based on an original photo by Peter Wright (photo copyright Peter Wright -- used with permission). Photographed at Correo, New Mexico, October 7, 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.