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Network availability

Network availability is about keeping the railway open when required by passengers and freight customers.

Our network availability performance is measured using the Possession Disruption Index (PDI), an indicator developed with the Office of Rail and Road.

The PDI quantifies the impact of planned engineering work on passengers (PDI-P) and freight traffic (PDI-F). The disruption is compared to the figures for 2007/8 (the last complete year before the indicators were developed) to calculate the index.

In addition to the PDI, we've developed other measures of network availability. Explanations of all the measures are included in the Possession Indicator Report. All the network availability measures are reported every four weeks in the report:

Possession Indicator Report for P1 2017-18

Possession Disruption Index 2006 – 2016

Possession Disruption Index for Passengers

It has not been possible to update reporting at the present time due to issues with the network availability reporting system. As soon as the figures become available reporting will recommence.

The Possession Disruption Index for Passengers (PDI-P) measures the excess journey time that passengers experience as the result of planned engineering and maintenance work.

PDI-P for period 13, 5  March 2017 – 31 March 2017

The Possession Disruption Index for Passengers moving annual average was 1.25

This compares to 1.10 for the same period last year.

The PDI-P is reported four weeks in arrears.

Possession Disruption Index for Passengers (National)

Possession Disruption Index for Freight

The Possession Disruption Index for Freight (PDI-F) measures the disruption to freight services as the result of planned engineering and maintenance work.

PDI-F for period 01, 1 April 2017 – 29  March 2017

The Possession Disruption Index for Freight moving annual average was 1.05

This compares to 0.85 for the same period last year.

Possession Disruption Index for Freight (National)

Our targets

The Office of the Rail and Road has set us very challenging targets for 2014-2019:

  • disruption to passengers to be reduced by 8 per cent
  • disruption to freight customers to be reduced by 17 per cent.

We're working closely with the industry to enable us to carry out our Railway Upgrade Plan works in the safest and most cost effective way while minimising disruption.