Very informative, thanks! Have seen those links in the past, but the added context helps. The British Steel list in particular shows how weight doesn’t correlate with height.
So, in summary, Code 100 is suitable for the most modern 60E1 only, and Code 75 is a better representative of rail ftom the 50’s to 2000’s?
Is the current Irish rail profile 60E1?
Talk about life imitating art!