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October 17, 2017, 06:35:19 AM *
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Author Topic: Public Performance Measure (PPM) details  (Read 579 times)
froome
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« on: September 17, 2017, 09:19:20 PM »

Not sure if this is the right place to post this, so please do move it if not.

How detailed are figures made for PPM and CaSL (Cancellation and Significant Lateness)?

I'm asking because I was up north earlier this week, staying in one of my favourite spots, Arnside (on the Lancs/Cumbria border), and noticed that on Arnside station they have a poster showing performance measurement for the trains that called there during the previous month, i.e. how late they were when reaching Arnside station during August. This showed not just how many were late by more than 5 minutes (the PPM threshold I believe) but a breakdown of the time those trains were late, i.e. 5-10 minutes, 10-20 minutes, 20-30 minutes and over 30 minutes, the latter being classed I believe as CaSL.

Had these figures been supplied by the train operator, or would they have been gathered by an enthusiastic passenger group there?

Do any other stations have notices showing these in this much detail? It seemed like a very good idea to me, and knowing the village, I suspect it is the sort of place where there will be an assiduous passenger user group who may well be responsible.
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Chris from Nailsea
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« Reply #1 on: September 17, 2017, 10:18:04 PM »

Not sure if this is the right place to post this, so please do move it if not.

Thank you for posting your topic here, froome.

I really cannot see where better it could be placed, so we'll continue the discussion here.  Smiley

My own observations on the subject are: Yes, I suspect that those particular figures may well have been gathered by an interested passenger / group, and published in that poster at Arnside station.

It's all information in the public domain: they will have simply distilled it and posted the specific details for that station, at that station.

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grahame
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« Reply #2 on: September 17, 2017, 11:53:16 PM »


Had these figures been supplied by the train operator, or would they have been gathered by an enthusiastic passenger group there?


http://www.recenttraintimes.co.uk is a good data source.

Here is a log for the last few weeks for weekend afternoons, trains scheduled from Westbury to Melksham to arrive between 14:00 and 22:00.   I suspect this could easily be "scraped"

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TransWilts Rail - Linking North to West and South 9 times a day. [see here]
froome
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« Reply #3 on: September 18, 2017, 06:33:46 PM »

Many thanks for the responses. Out of interest, does anyone know of any GW territory stations where this amount of detail is posted?
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SandTEngineer
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« Reply #4 on: September 18, 2017, 07:24:04 PM »

Many thanks for the responses. Out of interest, does anyone know of any GW territory stations where this amount of detail is posted?
If you go to the website quoted in Grahames post above you can enter details and time periods for the station report you require.  You can filter the results using many options to get the data you want.  Its quite straightforward.
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grahame
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« Reply #5 on: September 18, 2017, 08:08:14 PM »

Many thanks for the responses. Out of interest, does anyone know of any GW territory stations where this amount of detail is posted?

No knowledge of such stuff being specifically posted at the stations, which I think is your question?  I am aware of significant data extraction in the past - we did it on "Save the Train" for both our own line and for the Severn Beach line.   However, that was to allow our campaign-mode operation that was appropriate at that time to highlight the system falling down whenever it did, and permission to post it at the station would have been unlikely to have been granted.

I would love to be able to publish a really boring straight line plot showing zero cancellations and zero delays of more than five minutes for week after week, month after month.  I fear that TransWilts is just about the toughest case to achieve that with lots of interesting stuff around at both ends of the line to get in the way, and those d**ned stone trains - the only reason the line survived the 1970s - getting in the way too.   When using "recent train times", I tend to switch to trains within 10 minutes rather than trains within 5, in appreciation of the capacity issues - and still don't highlight week on week comparisons ...
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TransWilts Rail - Linking North to West and South 9 times a day. [see here]
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