by Blake Watts
BNSF Railway 3GS21B puzzle, based on an original photo by Blake Watts (photo copyright Blake Watts -- used with permission). Photographed at Alvin, Texas, March 30, 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.