Originally Posted by
joejones
If you're going to do that, it may be faster and just as cheap to take the Keisei Skyliner or limited express (whichever is departing first) to Nippori, then change to the southbound Yamanote Line, which also goes to Shimbashi.
I second this option -- Nippori station now has elevators down to the Yamanote line from the JR Transfer section or the JR ticket gate side too!
Sanosuke!