On 2011\07\08 14:12, Northolt Park Gates wrote:
On Jul 8, 1:40 am, Basil wrote:
It turns out that for Saturday and Sunday, the District Line is shut
from West Kensington to Ealing / Richmond, and the North London Line is
shut from Willesden to Richmond. Since these three services are the only
three serving the Chiswick Park / Gunnersbury area, I'm wondering if it
was necessary to shut all three at the same time, when no track or
structure is used by more than two.

Could be that all three services share the same metals at some point?

I just said that they don't. They could conceivably share the same power
section, although it would be very poor design if they did.