I swear I've used Ross curves with a Ross switch in place of GG curves to compete an arc, but in this case with the O54/O72 switch it doesn't seem to work. As you can see, the bottom arc doesn't end on a straight plane. John connected the switch to the curve and got the same result, so he used flex track to even things out. In the top arc, I connected the switch to the straight track, then cut a filler from a GG O72 curve to complete the connection.
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