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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  • C

  • CBA

    Cost benefit analysis.

  • CC

    Competition Commission

    The CC conducts in-depth inquiries into mergers, markets and the regulation of the major regulated industries, undertaken in response to a reference made to it by another authority.

  • Change of aspect - NFF

    An unintended change of aspect (red, yellow, green) by the signalling system, which when tested, could not be found to be faulty. (No Fault Found.) 

    (Signalling systems are designed to ‘fail safe’ with any change always being to a more restrictive aspect, e.g. yellow to red.)

  • CIMAH

    Control of industrial major accident hazard

  • Class representative committee

    The committee charged with considering and approving changes to the Network Code under part C of the Network Code.

  • CMEO

    The Railways (Class and miscellaneous exemptions) Order 1994 exempts, among other things, certain named railway assets and categories of railway assets from the licensing provisions of the Railways Act 1993 (as amended).

  • COMAH

    Control of Major Accident Hazards

  • Cordon cap

    Places an obligation on Network Rail to provide only a certain number of train paths through the cordon (route), even if the TOC has rights that would exceed this limit.

    A cordon cap is implemented when the total number of access rights to a path, if used, would exceed the remaining capacity of the network.

  • COT

    Condition of track

  • CPS

    Crown Prosecution Service

  • CTSA

    Channel Tunnel Safety Authority