Google added 3 new locations to the Transit service:

Notice the differences between:
http://googleblog.blogspot.com/2006/09/happy-trails-with-google-transit.html

and
http://www.google.com/transit

I noticed smth weird:
google.com/transit is in http://google.com/robots.txt
but if you search for "google transit", Google shows snippets/cache link. Yahoo and Live.com don't do that.

So Yahoo and MSN treat differently this entry:
<<google.com/transit?>> ?

Maybe the entry wasn't always in Google's robots.txt?