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



Reference CLC/TR 50451:2007
Title Railway applications - Systematic allocation of safety integrity requirements
Project Number 16655
Abstract/Scope The scope of this Technical Report is to define a method to determine the required Safety Integrity Level of railway signalling equipment taking in consideration • the operational conditions of the railway, and • the architecture of the signalling system. From a mechanistic point of view the task of this Technical Report is to define a method of calculation, which determines the integrity requirements (qualitatively and quantitatively) from the inputs stated above.


Current Stage code 6060
Current Stage code date 2007-05-16
Current Stage code deadline  
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 9
Reference Document  
ICS 45.020 - Railway engineering in general
93.100 - Construction of railways
Keywords Railway; Safety integrity
Note Supersedes R009-004:2001
Special National Condition(s)  


Categories - Aspects
Product Life Cycle
All Others Manufacturing, Use, Recovery, Disposal B2B, B2C


Deadline Date
6060 2007-05-16   export to doc file  EN
5099 2006-02-18 2006-04-18  
5060 2006-02-18 2006-02-18 export to doc file  EN
5020 2005-12-16 2006-02-17  
1090 2004-12-07 2005-06-07  

Implementation Dates

date of Ratification (DOR) (1) 2006-02-18
date of Availability (DAV) (2) 2007-05-16
date of Announcement (DOA) (3) -
date of Publication (DOP) (4) -
date of Withdrawal (DOW) (5) -


Supersedes R009-004:2001
Superseded by  
Normative reference (6) EN 50121-5:2006
EN 50126-1:1999
EN 50128:2001
EN 50129:2003

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of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn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