In message op.vg09em1lby8eno@sheepdog, at 21:19:24 on Fri, 6 Aug 2010,
Colin McKenzie remarked:
22. Park Royal: Central, Piccadilly

Anyone know what happened to this one? A few years ago it seemed to
be going ahead.

The office development that was to fund it has stalled. Theoretically
it's still a requirement if all the offices get built, but London
Underground were never keen, and the condition is likely to be dropped
if housing is built instead of offices.

A pity, and I still hope it goes ahead. It's easy to work out that
passengers from further out on Piccadilly or Central lines, going to a
zone 1 or 2 destination on the other line, benefit from changing at
Park Royal. So does LU, as it reduces number of stations passed and
number of interchanges made in zone 1, where tube capacity is most
strained. And they're more likely to get a seat. But this sort of
lateral thinking seems to be beyond London Underground.

It's also possible that people living "further out on the Piccadilly"
would use it as a short cut to/from the West End, thereby overloading
the Central.
--
Roland Perry