by Ed Wolfe
Burlington Northern Railroad SD40-2 puzzle, based on an original photo by Ed Wolfe (photo copyright Ed Wolfe -- used with permission). Photographed at Palmer Lake, Colorado, August 3, 1992.
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.