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 minute

    A measure equating to one train being delayed for one minute when compared with the timetabled journey time between two points.

  • 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: the Government department responsible for transport.

  • DLR

    Docklands Light Railway

  • DWP

    Department for Work & Pensions