In message , Boltar
writes

Something I was wondering the other day , when the extension to Heathrow
airport was built why didn't they re-extend the district line to Hounslow
and beyond and divert the piccadilly to ealing? Why? Because district trains
are much bigger and so they would have been much more room for passengers
and their luggage rather than the pokey little tube trains on the picc.

Was there a good reason for not doing this given the benefits it would have
entailed for passengers with luggage?

I imagine that the reason may have been that the Piccadilly goes more
directly to traditional "hotels zones" - Knightsbridge, Hyde Park Corner
(for Park Lane), Green Park (for Piccadilly) and Russell Square.

While the District serves Victoria (and also, like the Picc, Earls
Court) the cheaper hotels in these areas were seldom used by tourists
arriving by air in the days when the Heathrow extension was built -
their popularity has largely been a phenomenon of the much cheaper
flights of the last decade.

--
Paul Terry