by Greg Mross
Chicago & North Western Railroad SD40 puzzle, based on an original photo by Greg Mross (photo copyright Greg Mross -- used with permission). Photographed at Milwaukee, Wisconsin, December, 1985.
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.