I've been looking at track frames, and I get a bunch of names that I don't quite get.

Kerin frame style.
Pursuit style
True track frame
Track geometry.
Street geometry (on a "track" frame)..

Some of these appear to be just normal geom. frames with track drop outs. Some of them have wild sloping top tubes.

Can any one educate me or point me the way to some web site that would?