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Railway applications - The specification and demonstration of reliability, availability, maintainability and safety (RAMS)

Executive summary

Specification and demonstration of reliability, availability, maintainability and safety of railway applications.

Abstract

This European Standard:
• defines RAMS in terms of reliability, availability, maintainability and safety and their interaction;
• defines a process, based on the system lifecycle and tasks within it, for managing RAMS;
• enables conflicts between RAMS elements to be controlled and managed effectively;
• defines a systematic process for specifying requirements for RAMS and demonstrating that these requirements are achieved;
• addresses railway specifics;
• does not define RAMS targets, quantities, requirements or solutions for specific railway applications;
• does not specify requirements for ensuring system security;
• does not define rules or processes pertaining to the certification of railway products against the requirements of this standard;
• does not define an approval process by the safety regulatory authority.

This European Standard is applicable:
• to the specification and demonstration of RAMS for all railway applications and at all levels of such an application, as appropriate, from complete railway routes to major systems within a railway route, and to individual and combined sub-systems and components within these major systems, including those containing software; in particular:
• to new systems;
• to new systems integrated into existing systems in operation prior to the creation of this standard, although it is not generally applicable to other aspects of the existing system;
• to modifications of existing systems in operation prior to the creation of this standard, although it is not generally applicable to other aspects of the existing system.
• at all relevant phases of the lifecycle of an application;
• for use by Railway Authorities and the railway support industry.

History and related standards

This European Standard includes the following cross-references:

EN ISO 9001:1994, EN ISO 9002:1994, EN ISO 9003:1994, EN 50128, ENV 50129:1998, IEC 60050(191):1990 and IEC 61508 series.

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