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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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  28. Z
 

I

ILGGRI

International Liaison Group of Government Railway Inspectorates.

Industry committee

Alternative name for the access dispute resolution committee, the committee appointed under the access dispute resolution rules (ADRR).

Infrastructure incident

An event involving Network Rail owned infrastructure which may delay normal train operation.

Investments

Investments cover all enhancements but also include major projects such as route upgrades or the renewal of Network Rail’s telecoms network, which are largely renewals.

IQPC

International Quality & Productivity Centre

IRSE

Institution of Railway Signal Engineers