Paul Terry wrote:

A physical link, such as an underground passageway, would have been
possible during the many occasions when Hammersmith Broadway has been
rebuilt over the years. I suspect that it never happened because the
number of passengers requiring such an interchange is very small indeed.

If there was never an underground passageway, then what "Subway to
District and Piccadilly lines" is this (former) sign referring to?

http://greenberger.no-ip.com/gallery...geViewsIndex=1
--
David of Broadway
New York, NY