Performance
| National Express East Anglia |
94.39 %
93.23 %
90.65 %
|
|---|---|
| Mainline |
93.56 %
91.74 %
87.56 %
|
| Rural Routes |
89.11 %
91.50 %
90.81 %
|
| Metro |
97.52 %
95.05 %
92.61 %
|
| West Anglia |
95.05 %
94.23 %
92.09 %
|
| Stansted Express |
93.24 %
91.15 %
87.46 %
|
Performance
View all Train Operators Performance for 2009/10 here
What is PPM?
PPM, or Public Performance Measure, is the method that train companies use to measure and report the performance of train services at their final destination.
The PPM figure is calculated by counting the number of trains that arrive at their destination on time.
The following criteria can cause a train to be classified as a PPM failure:
Arrived at its final destination greater than 4 minutes later than the advertised arrival time (or greater than 9 minutes for Intercity services)
Did not run at all
Did not complete its booked journey
Did not call at all its booked stations
The measure of the lateness of trains is taken automatically from the signalling system. Some manual recording takes place in rural locations.
The number of trains that arrive on time is then divided against the number of trains scheduled to run that day to give the daily PPM measure.
On the occasions when there is a need to implement a temporary timetable, the daily PPM will, under certain circumstances, be measured against any amended timetable.
National Express East Anglia collates the PPM figure on a daily, four- weekly and annual basis. When the PPM figure is quoted as a Moving Annual Average, or MAA, this is based on an average of the previous 13 four-weekly periods of data. The MAA, therefore, gives an accurate picture of how trains have performed over an annual or 52 week period.
The PPM figure is collated for National Express East Anglia train services as a whole and for the following routes:
West Anglia
Services to/from Liverpool Street or Stratford to/from Kings Lynn, Ely, Cambridge, Hertford East, Cheshunt, EnfieldTown or Chingford.
Stansted Express
Services to/from Liverpool Street to StanstedAirport
Metro
Services to/from Liverpool Street to GideaPark, Shenfield, Southend Victoria and Southminster. Also includes the Romford to Upminster route.
Mainline
Services to/from Liverpool Street to Chelmsford, Braintree, Colchester, Clacton, Walton on Naze, Harwich, Ipswich and Norwich. Also includes the Marks Tey to Sudbury route.
Rural
Services to/from Norwich to Cambridge, Sheringham, Cromer, Great Yarmouth and Lowestoft. Also services to/from Ipswich to Cambridge, Peterborough, Lowestoft and Felixstowe.