"D7666" wrote in message
...
On Dec 19, 5:56 pm, "Peter Masson" wrote:

For each train turned back in St Pauls Sidings you lose two paths to
Farringdon, one as it goes into the sidings and one as it comes out.

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.

------
But the one out of the sidings also takes up a path from City Thameslink to
Farringdon, as it has to cross that line.

Peter