Calling pattern not needed on some parts of the MET?

On this subject, why does the PIS at Kings Cross announce a west bound Met service as 'All stations' but then follow it with 'Calling at Finchley Road, Wembley Park'.... If its all stations why omit some?

Finchley Road and Wembley Park are now the next two stations on the Met after Baker Street, but it was not always so. Since 1940 the stopping service has been supplied by the Bakerloo, and more recently the Jubilee. However, undertsand a few Met trains did serve some intermediate stations north of Finchley Road for some years (CULG suggests this happened as late as 2000), and this may be why trains which do not, although always in the vast majority, are identified. Such interworking is not now possible because of incompatible signalling systems.

It is inconsistent if they omit Euston Square, GPS and Baker Street, although of course all trains do indeed call there.

A similar situation exists on the Piccadilly which, certainly when I used it regularly, always displayed at Hammersmith and Acton Town "Not stopping at Ravenscourt Park, Stamford Brook, Turnham Green, Chiswick Park", except for the odd services which did. (Seeing "Turnham Green" not light up was always a welcome sight late at night)

I think that nowadays even the fast and semi-fast northbound trains have the misfortune to be stopped at Wembley Park, whilst in the morning rush hour the fasts and semi-fasts continue to run through without stopping.

This seems to be part of a long-term reduction in stations skipped - in the 1990's all fasts and semi-fasts non-stopped this station and some fast trains also ran through Harrow On The Hill without stopping. The non-stop run Finchley Road - Moor Park journey was timetabled to take 19 minutes! Also in those days some BR trains called at Moor Park (none do 'today').

In years gone by fast trains also ran to Uxbridge and Watford. But in those days passengers to Uxbridge had a choice of transport provider and could also travel via the GWR / BR service to Uxbridge.

Simon

When the S stock CIS was being schemed a fair bit of thought and consultation went into all this, including a look at 'best practice' by Met line 'A' stock drivers on the Public Address as well as practicalities of what could be done with the software system.
It's never been widespread practice to mention 'All Stations' south of Finchley Road on SB trains, so S stock doesn't either.
On the point about changing from Fast or Semi-fast to 'All Stations', we do that at the station from where the train will indeed stop at all stations. It was simplest to keep doing that for the rest of the trip.
As on the other S stock lines, if the entire (timetabled including special services) trip can only credibly be 'all stations' the CIS doesn't mention stopping pattern at all. Two examples are the destination of Harrow-on-the-Hill with the train starting from Uxbridge or Watford.
Slightly anomalously the return trip starting at Harrow and going to Uxbridge or Watford does say 'All Stations' because the CIS 'Trip' is actually the same code as if the train had started from Aldgate but the train picks up the sequence from where it starts on that route, in this case Harrow.

Looking at the data again it wouldn't be that difficult to make it say 'All Stations' at Harrow or Moor Park as a NB train stops being Semi-fast or Fast respectively, then not mention it at subsequent stations. I seem to recall maybe it is the way it is to provide more reassurance to passengers unfamiliar with the Met line but who have heard it's a bit odd out there!

I don't think that's it. Met line T/Ops do the whole line not just one branch and there are plenty of Northbound Fasts and Semi-fasts for the other branches in the evening peak. They all use the same tracks as far as Harrow and the route from platform 1 on to the Uxbridge branch avoiding the flyunder was removed about 50 years ago.  Just a quirk of the current timetable.
Strictly a limited stop Uxbridge service these days is a Semi-fast.  Fast means a train non-stops some stations North of Harrow too.  Nothing like that on the Uxbridge branch now.  I've heard that years ago there were some that skipped West Harrow and maybe Rayners Lane.  And there were certainly trains that non-stopped Harrow.

I think it would have done briefly yes.