Tri,
I talked about the two different saddles and their rail lengths in this thread:
http://forums.teamestrogen.com/showthread.php?t=12921
I had the "S" model which has shorter nose and shorter rails, "for women".
Now I have a non-women's Brooks, which has WAY longer rails (and longer nose).
Yes, I really DID get a 1 1/2" shove back amount- and I love it!