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The number of trains that arrive on time has risen dramatically since we took over the running of Britain's railway in October 2002
The public performance measure (PPM) shows the percentage of trains which arrive at their terminating station on time.
PPM combines figures for punctuality and reliability into a single performance measure. It is the industry standard measurement of performance.
The national PPM is 84.6%.
This compares to 86.2% for the same period last year.
The moving annual average (MAA) is 89.3%.
The table below shows the average PPM for Britain as a whole and by train operating company. The moving annual average is calculated over the 365 days to 08 November 2014.
Punctuality %period 8 2014/15
A breakdown of each operator's performance, known as sub-operator PPM, is available to download:
Sub-operator PPM, Period 8 2014 / 15
Right-time performance measures the percentage of trains arriving at their terminating station early or within 59 seconds of schedule. The process for gathering data of this accuracy is currently not 100% reliable and the industry is working on improving the quality of this information to make right-time data more reliable.
The moving annual average is calculated over 365 days to 08 November 2014.
Right time % moving
A train is counted as being cancelled if:
A train is counted as being significantly late if it arrives at its terminating station 30 minutes or more late.
CaSL is not a regulated measure for Scottish train operators.
This measures the average lateness of a passenger as they alight from their train.
For each train, this is calculated by multiplying the number of passengers expected to alight at main stations by the punctuality to the nearest minute at those stops.
If the train is cancelled, we calculate it by multiplying the number of expected passengers by 1.5 times the service frequency on that route.
The delay split shows who was responsible for passenger train delays of 3 minutes or more.
The delay split was calculated over 365 days to 08 November 2014.
PPM measures the performance of individual trains advertised as passenger services against their planned timetable as agreed between the operator and Network Rail at 22:00 the night before. PPM is therefore the percentage of trains '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 (ie 4 minutes 59 seconds or less) of the planned arrival time for London and South East or regional services, or 10 minutes (ie 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 will count as a PPM failure.
Note: unless specified otherwise, all data on and linked from this page is for initial indications only and is subject to change in subsequent publications.
The common causes of delays - and what we're doing to reduce their frequency and impact.