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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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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. 
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DAG

Delay Attribution Guide : Document that provides guidance on the attribution of delay, between parties, across the network.
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Data refresh

Process of re-producing a fresh set of results from data which may have been updated since the original results were produced from that data.

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Deemed Minutes

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

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Defective rail

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

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Delay Minute

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

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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.

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Derailment

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

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DfT

Department for Transport: the Government department responsible for transport.
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DLR

Docklands Light Railway
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DWP

Department for Work & Pensions
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