In message , Paul Corfield
writes

I think someone has underestimated the timing and pathing issues here.

As all trains will need to reverse at Acton - that's all Heathrows,
Rayners Lane and the Ealing Shuttle via one (?) turnback siding [1]
between the Picc Line tracks I think a 20 minute frequency is pretty
good going! The working arrangements are going to have to be pretty
slick to handle all the movements without huge train jams developing on
the approaches to Acton from the west.

[1] happy to be corrected by our resident train drivers if I've got this
wrong. I can't find my track plan.

Paul, there are 3 sidings at the east end of the station, but the
principle's the same.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)