I see lots of "track bikes" in bike catalogs, like the Bianchi Pista and LeMond Sarthe and Langster and they are more designed for street use than velodrome racing.

So why are they called track bikes when they should be advertised as Fixed Gear bikes?

On the other hand...

I see lots of articles for track racing in the UK cycling magazines and those bikes that are "real" track racing bikes are bikes that I've never seen in any bike catalogs or on the street and they look like UFOs or something, where can you buy one of those? (Not like I'm going to).

For example: