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Performance Analysis - PPM

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Performance Analysis - PPM 18/05/2020 at 01:01 #126901
DavidSplett
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45 posts
Much as I hate PPM in real life, with this being one way signallers are measured in real life, would it be possible to include this in the performance analysis? In other words number of trains which arrived at destination within 5 mins?
Last edited: 18/05/2020 at 01:01 by DavidSplett
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Performance Analysis - PPM 18/05/2020 at 07:05 #126906
JamesN
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1196 posts
1) PPM isn't always 5 minutes - for long distance services it's often 10, and there's other values used as well (Heathrow Express for example is a 3 minute PPM).

2) What happens when the destination isn't in sim? If we're judging players against that measure, is it fair to presume how late the train left the sim = how late the train got to destination? In some cases maybe, but it doesn't account for any make up time beyond the player's control area.

3) What about historic timetables? PPM is a product of the privatised era, so it's not an appropriate measure for say an 80s Motherwell timetable. Same for the international sims - they're not on UK performance regimes whatsoever.

4) Finally, I think it's stretching it a bit to say signallers are measured against PPM - the regulation policies in some/most signal boxes are to regulate for PPM, but the managers don't sit their signallers down at performance reviews and start listing off percentages PPM made on their shifts - they might just highlight the odd occasion where perhaps regulation policies weren't followed and it's caused appreciable delay.

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Performance Analysis - PPM 18/05/2020 at 18:57 #126916
DavidSplett
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45 posts
JamesN in post 126906 said:
1) PPM isn't always 5 minutes - for long distance services it's often 10, and there's other values used as well (Heathrow Express for example is a 3 minute PPM).

2) What happens when the destination isn't in sim? If we're judging players against that measure, is it fair to presume how late the train left the sim = how late the train got to destination? In some cases maybe, but it doesn't account for any make up time beyond the player's control area.

3) What about historic timetables? PPM is a product of the privatised era, so it's not an appropriate measure for say an 80s Motherwell timetable. Same for the international sims - they're not on UK performance regimes whatsoever.

4) Finally, I think it's stretching it a bit to say signallers are measured against PPM - the regulation policies in some/most signal boxes are to regulate for PPM, but the managers don't sit their signallers down at performance reviews and start listing off percentages PPM made on their shifts - they might just highlight the odd occasion where perhaps regulation policies weren't followed and it's caused appreciable delay.
Point 1 would be difficult to square up as like you say there’s differentials. For point 2 it could only be done for trains which terminate within the sim, whilst this may be worthless for some sims, for something like King’s Cross where many trains terminate and many of those are captive it would be relevant.

It isn’t a big thing, but if it’s something which could be incorporated relatively easily then I’d find it interesting. For old timetables then it could simply be ignored for those who aren’t interested. I do understand the points made, and in real life I’m not particularly fond of the system myself, however many places nowadays seem to regulate by it, so if that’s what real life does then it would be good to have it reflected, if it could be incorporated relatively easily.

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Performance Analysis - PPM 18/05/2020 at 19:44 #126918
wellgroomed
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51 posts
It's an interesting concept. I agree with JamesN in terms of thoughts.

There is the lesser known FPM too for freight (15 mins at destination). Certainly for a few of my regular favourite sims, none of them reach their destination on these routes.

Also CASL (cancellations and significant lateness) to consider and we're moving ever closer to an on-time (0 mins late or lesser) railway target too.

There are (or certainly used to be) three 'PPM' measuring points for one of the original 25 TOCs too. I'm not sure what measurement is the case is now, it might be the gap in service intervals rather than by PPM

It's gradual, but I fully expect PPM as we know it now will not be flavour of the decades as time progresses.

My approach to play is always balanced between that of a Signaller and that of a Controller.

Both have their equal and valuable parts to play in the running of a safe, reliable railway; which can broadly be mirrored by SimSig, but would perhaps have difficulty in being measured by PPM.

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