by Georg Trüb
SBB ETR 610 puzzle, based on an original photo by Georg Trüb (photo copyright Georg Trüb -- used with permission). Photographed at Chamoson, Switzerland, September 19, 2022.
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.