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Glossary

Browse the A-Z below for some rail-specific terms that are used in this website, together with their meanings.
 

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D

DAB

Delay Attribution Board : Body that manages and oversees the effectiveness and accuracy of the delay attribution process and the use of the Delay Attribution Guide (see below).  Also considers proposed amendments to Delay Attribution Guide and provides guidance to rail industry parties to assist in the resolution of disagreements concerning delay attribution. 

DAG

Delay attribution guide : Document that provides guidance on the attribution of delay, between parties, across the network.

Deemed minutes

A pre-determined value in delay-minutes given to the cancellation of a train.

Defective rail

A rail which has any fault requiring repair or replacement within a timescale commensurate with the nature of the defect.

Delay minutes

Incidents which cause delays to trains produce delay minutes. Network Rail delay minutes represent the total number of minutes delay to passenger and freight trains, where the cause of delay is attributed to Network Rail. 

Derailment

When a train’s wheelset runs off or leaves the track.

DfT

Department for Transport

Disaggregated detail

In November 2011 Network Rail completed devolution of power for running the railways to its ten operating routes. In order to ensure transparency, Network Rail produce and publish detailed financial and operational performance information for each of the routes.

DLR

Docklands Light Railway.