Click the green flag. Use number keys for menu. You can choose one of 4 standard layouts but you can also edit the layout. It also offers 5 different engine costumes to choose from. Change the speed to start the engine moving. The points (switches) can be set by clicking on them - if no green curve is shown they're set for straight ahead. If I'm using the username block when you run it it's just so I can change the code without affecting how it appears for anyone else until I'm ready to reveal changes.
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