Roger: I'm not sure about the Atlas switches, but I'll post details of the peco ones. You didn't say which scale, so I'll do both HO and N.
HO: (code 100 and 75)
frog angle 12 degrees on all 3.
Nominal radius: 24", 36", 60".
The frog angles are all the same except for the double curved switches which are 30"/60" radius, and the short crossing and short Y which are 24 degrees.
The code 83 track should match NMRA specs, but my old catalog doesn't give details.
N: (code 80)
frog angle M:14 degrees, L: 8 degrees.no small.
Nominal radius: 18", 36".
N: (code 55)
frog angle 10 degrees on all 3.
Nominal radius: 12",18", 36".
Don't know why the geometry is different for the 2 N sizes.