by Greg Mross
Union Pacific AC45CCTE puzzle, based on an original photo by Greg Mross (photo copyright Greg Mross -- used with permission). Photographed at LaPorte, Indiana, July 2, 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.