confused about vertical & horizontal track clearance standard for O gauge

Model Railroader Layouts and layout building
1

I have O-54 and O-42 curves that because of overpass contruction require careful clearances. My testing shows a minimum inside the curve clearance of 2.25" and outside the curve clearance of 1.75". Vertical is 5.25 Any guidlines? Thanks

2

HUICZ,
Have you looked at the NMRA Standards yet ?
http://www.nmra.org/standards/s-7.html
Bob
NMRA Life 0543

3

Thanks. Yes I did look at the NMRA tables. Their recommendation did not match my own ‘rolling stock on track’ measurements for 0-54. For example: the inside and outside the curve horizontal clearances are quite different by my direct mesurement. The NMRA table does not make that distinction. I distrust my interpretation of their data. That’s why I post the question.