The public performance measure (PPM) combines figures for punctuality and reliability into a single performance measure.
It was the industry standard metric and Network Rail’s regulatory measure during CP5.
PPM is the percentage of trains which arrive at their terminating station ‘on time’ compared to the total number of trains planned. A train is defined as on time if it arrives at the destination within five minutes (i.e. 4 minutes 59 seconds or less) of the planned arrival time for London and South East or regional services, or 10 minutes (i.e. 9 minutes 59 seconds or less) for long distance services.
Where a train fails to run its entire planned route calling at all timetabled stations it counts as a PPM failure.
Performance for 13 December 2020 – 09 January 2021 (Period 10)
The national PPM is 91.8%
This compares to 83.0% for the same period last year.
The moving annual average (MAA) is 91.4%
More detailed data, including historic punctuality figures, can be found on the Office of Rail Regulation (ORR) website.
The public performance measure (PPM) shows the percentage of trains which ran their entire planned journey calling at all scheduled stations and arriving at their terminating station within 5 minutes (for London & South East and regional services) or 10 minutes (for long distance services). It combines figures for punctuality and reliability into a single performance measure. It is the current industry standard measurement of performance.
Transport Focus consult more than 50,000 passengers a year to produce the National Rail Passenger Survey (NRPS) – a network-wide picture of passengers’ satisfaction with rail travel. Passenger opinions of train services are collected twice a year from a representative sample of journeys.
Passengers’ overall satisfaction and satisfaction with 30 specific aspects of service can, therefore, be compared over time.
This chart below shows who was responsible for passenger train delays of 3 minutes or more.
For regulatory reasons, Network Rail is assigned responsibility for delays caused by external factors such as weather, trespass, vandalism, cable theft and fatalities.
Exceptional weather conditions beyond our infrastructure design including temperatures below -5°C or above 30°C, storm winds which cause physical damage e.g. gusts of more than 65mph, snow of depth greater than 15cm or rainfall greater than 150mm in a 24 hour period. For regulatory reasons, delays caused by extreme weather are attributed to Network Rail.
These are issues which could have been prevented such as operational issues, damage to or failure of the infrastructure of the railway such as tracks, signalling or points, including where bad, but not extreme, weather causes delays to the rail network.
These are issues which Network Rail couldn’t have foreseen, such as vehicles hitting bridges and trespassers on the line.
Issues which the train company couldn’t have foreseen such as passenger action or illness on trains, damage to trains by road vehicles or the forced closure of a station they manage.
Issues which the train company could have prevented such as defective trains or a lack of train staff.
One train company having their services delayed by the actions of another train company such as a delayed train from one company causing other trains to be delayed.
Train companies having their services delayed because of the actions of a freight train on the network.
Full details of the delay attribution rules can be found on the Delay Attribution Board's website.
To find out more about what can cause delays on the network please visit our Delays explained page.