International Standards and Conformity Assessment for all electrical, electronic and related technologies


Electrical and electronic applications for railways



Reference EN 50126-1:1999/AC:2012
Title Railway applications - The specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Basic requirements and generic process
Project Number 24448
Abstract/Scope 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. NOTE: Guidance on the applicability is given in the requirements of this standard


Current Stage code 6060
Current Stage code date 2012-10-05
Current Stage code deadline  
Deadline date for vote  


Directive(s) RAIL (2008/57/EC)
Mandate(s) M/483
Order Voucher  


IEC Technical Body  
Reference Document  
Keywords Railway applications; Reliability; Availability; Maintainability; Safety
Note Corrigendum issued in October 2012 on German version only due to missing Figure 9
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2012-10-05   export to doc file  DE
1099 2012-09-20    

Implementation Dates

date of Ratification (DOR) (1)  
date of Availability (DAV) (2) 2012-10-05
date of Announcement (DOA) (3) -
date of Publication (DOP) (4) -
date of Withdrawal (DOW) (5) -


Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.