Ref above sdmann post.
Good ... on the O54 for my 90 degree Gargrave track turns on my layout.
My turnouts are all Ross Superline O72, plus paired Ross Superline 11 degree turnouts connecting my two Gargrave oval sets of tracks, and lastly I have a pair of Ross Superline O72/O96 curved switches at one end of my layout. So, now comfortable going ahead with one of the 3rd Rail E5/6s.
Tom