by Peter Crook
Union Pacific ES44ACH puzzle, based on an original photo by Peter Crook (photo copyright Peter Crook -- used with permission). Photographed at Mojave, California, April 9, 2014.
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.