On Sunday, 1 September 2013 12:44:23 UTC-7, wrote:
On Sun, 01 Sep 2013 20:21:28 +0100

Paul Corfield wrote:

upgraded line in recent years. The Vic Line was closed across the

Central Area and elsewhere for weekend after weekend. We endured years



The Vic line was switching from one ATO system to another with potential

interworking and interference issues. The northern line is switching to ATO

from trip cocks and signals with no possibility of the new system affecting

the old. Therefor it would be entirely possible for them to install the lot

then test it every night for months on end for a few hours each time with no

inconvenience to the public.

IMHO it is better to simulate several hours of normal operation sans passengers.