George,
Yes, the hangers attach to the frame. There is enough play in the linkage to be flexible around most curves. For tight curves the brakes could be hung from the truck.
I was able to locate photo of the arrangement on North Pacific Coast "Sonoma". Here is a link to the image:
Sonoma Brake Hanger
According to the Spec for "Sonoma" and sisters, the tenders were only delivered with brakes on a single truck (rear).
Sadly I do not have the drawing for the brake heads to verify if that is the correct head or not, but it looks the part. I will see if I can get a hold of Craig Hoefer who did the header artwork on PacificNG, he has drawn most of the 8-18C Plan 4 locomotive in CAD.
Bob: Are you building a specific locomotive? Do you have the spec for it?
Andrew Brandon
A fixture here since Y2k.
[
www.pacificng.com]
[
www.spnghs.org]
"An end to red domes in our lifetime!"