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To visualize a puzzle imagine track shaped like the letter H then take the bar out of the H and squeeze it together in the middle. A puzzle allows the movement from a track coming from one direction to either of the tracks going the other direction. They were used in places where space was in short supply. Although I think many times they were over used. We had a puzzle in the yard where I work that they removed and replaced with two switches facing point to point. At Chicago Union Station the puzzles were taken out about 15 years ago. Puzzles are high maintenance, so they were removed at the expense of flexibility. NO longer can a train move from main 1 all the way to main 4 within the confines of the Union Station plant.
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