Thanks for the info and the links! I learned a lot from reading.Paul, wye turnouts are different; the frog number isn't the amount of diversion from the through route like it is in conventional turnouts. Wye turnouts' frog # is the sum of the diversion BETWEEN the two routes...so it's really like a #8...except two of them back-to-back, sharing the same frog.
BUT...Peco did something a little different with their #4 Wye using a somewhat smaller radius to get a shorter turnout:
Read this thread...it's worth the trouble:
https://model-railroad-hobbyist.com/node/34901
At Fast Tracks, the place where you can learn to make your own turnouts, they have an extensive library of templates...printable ones.
https://www.handlaidtrack.com/tt-ho-y-4
Click on the 'download' icon and when it loads, you'll see, if you imagineer a through route instead of the other diverging route, that a #4 is really half of a #8 on each side.
Paul
