On Jul 4, 9:28*am, D7666 wrote:

IIRC when the 319s arrived on Thameslink the 317s went to Euston, replacing
the 310s. Subsequently 321s came to Euston, the 317s went to Kings Cross,
replacing the 312s.

The 319 317 310 cascade was created before 321s were ordered, so
can't be counted in the original Snow Hill route justfication.

Coming back to this point and about BR regions, the 319 317 310
was a straight LMR internal cascade.

Interesting that the 310s went over to the Tilbury lines, a former
LMSR route - but IIRC from a talk (?RCTS?) this had not actually
allowed been allowed for - the LMR were simply going to withdraw them,
and it was L+SE (as it then was) looking at the wider issues that took
them to the LT&S. I might not have the details of that all right, it
was a long while ago, I had this gen before I moved to Luton, and I
been here 20+ years (too many).

Another poster referred to the regions replaced by sectors - one
confusion point is the regions did not break up at the same time as
each other. IIRC the LMR was the last to go, well behind SR, and with
TL being what would have been a joint SR/LMR route this might have
added confusion. Once it did happen, the former exBedPan bit ''Network
north midland line'', or whatever it was, evolved into what became
''Thameslink'' sub-sector.

--
Nick