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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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I

ILGGRI

International Liaison Group of Government Railway Inspectorates.

Independent reporter reviews

The role of the independent reporter is to provide ORR with independent, professional opinions and advice relating to Network Rail's (as the railway licence holder) provision or contemplated provision of railway services, with a view to ORR relying on those opinions or advice in the discharge by ORR of its functions. 

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 renewals.

IRSE

Institution of Railway Signal Engineers