are you limited by space or money/time?
FWIW, many builders wish they would have used wider curves. All it takes is one large steam engine....or diesel nowadays....for that matter.
My 072/064 will be getting replaced by 096/088 and 084/076 Ross Sectional Curves.....but that's all I have room for.
In the immediate term, money & time, but my future layout is bounded by the concrete walls of the house on 3 sides, so space is somewhat of a concern. O-72 would be...ambitious, but I may be able to work O-63 for the main line.
The problem is that we'll need to have at least part of the room for useable space outside of the layout.
On second thought, a larger radius curve may be necessary to reduce the grade up to the overpass on the main line....
