On Wed, 9 Aug 2017 07:25:17 -0000 (UTC), Recliner
wrote:

Not any more they don't. A lot of resources were used to make sure
those 'long trains' can't try to escape towards the Met line.

The signaling from Hanger Lane to Rayners Lane has not had the
appropriate immunisation from those nasty S stocks.

The District and Picc lines share track from Acton Town through Ealing
Common station to Hanger Lane Junction. Once in a while, a District line
train gets sent, wrongly, towards North Ealing, and occasionally Piccadilly
line trains serve Ealing Broadway.

Years ago it used be a District route shared with the Piccadilly but
that stopped long before the line was extended to Heathrow

Originally it was purely a District line route all the way to Hounslow. The
Piccadilly line came later.
--

Steve F.
London Docklands, E16, UK