by Mike Bates
Union Pacific SD70ACe puzzle, based on an original photo by Mike Bates (photo copyright Mike Bates -- used with permission). Photographed at Denton, Texas, May 27, 2018.
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.