In message , at 10:12:30 on Sat, 25
Aug 2018, Robin9 remarked:

I've always been deeply sceptical about the 24 tph schedule through "the
core" as to both its feasibility and its necessity. Is 24 tph a
prerequisite for the Kings Cross throat project?

In the long run 24tph is a prerequisite for 6tph to Cambridge/Kings
Lynn. (Up from 4tph last year).

In the short run they could make do with 23tph in the core by postponing
the increase from the current 5tph to 6tph, and in any event that 6th
train is to Brighton, so doesn't impact Kings Cross.

And if that's not enough of a relaxation, they can always postpone some
of the MMLSouthern through running which also contributes to the
increase from [whatever pre-Dec19] to 24tph overall.

What they do need, however, is to increase [whatever is the core tph
today] by two, to get the two currently-KGX-terminating slows into the
core.
--
Roland Perry