Moonman posted:You have the right combination of degrees with 3 -O42 and 2-O27. Just cut an O42 by measuring 5.5" from rail end to rail end of the outside rail to create an O42 1/2 curve.
Then, the combo is O42>O42-1/2>O27>027>O42-1/2>O42
30°>15°>45°>45°>15°>30° = 180°
It is about 31.5"-32" outside rail to outside rail wide.
here it is compared to the alternating proposal that you have:
Both may work, but the wiggling of the alternating pattern may cause strange behavior of the trains.
Great idea. Thanks.