Two loops one inside the other, with points to allow crossing from one loop to the other. I have shown two controllers connected to this layout but it will work with just one. See Connecting Multiple Controllers for more information.
| Combination 1 | |
|---|---|
| 1 | Basic Oval |
| 2 | x 4515 |
| 2 | x 4520 |
| 1 | x 4531 |
| Combination 2 | |
| 2 | Basic Ovals |
| 2 | x 4515 |
| 1 | x 4531 |