On 19 Dec, 18:11, D7666 wrote:
Not if the path of one NB train that goes into the sidings is taken up
by the Down train from Moorgate, and the one out of St.Pauls by an Up
train into Moorgate.

The timetable already has to be planned around making the flat
junction south of Blackfriars work, and (hypothetically) making the
Moorgate branch junction work. You'll be very lucky to come up with a
workable timetable that allows all three to work efficiently and which
doesn't sacrifice a big chunk of capacity and/or resilience.

U