CLC/TR 50126-3:2006

SLOVENSKI SIST-TP CLC/TR 50126-3:2006

STANDARD
september 2006
Železniške naprave – Specifikacija in prikaz zanesljivosti, razpoložljivosti,
vzdrževalnosti in varnosti (RAMS) – 3. del: Vodilo za uporabo EN 50126-1 za
RAMS za vozna sredstva
Railway applications - The specification and demonstration of Reliability,
Availability, Maintainability and Safety (RAMS) - Part 3: Guide to the application of
EN 50126-1 for rolling stock RAMS
ICS 29.280; 45.020 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

TECHNICAL REPORT
CLC/TR 50126-3
RAPPORT TECHNIQUE
May 2006
TECHNISCHER BERICHT
ICS 29.280; 45.020
English version
Railway applications –
The specification and demonstration of
Reliability, Availability, Maintainability and Safety (RAMS)
Part 3: Guide to the application of EN 50126-1
for rolling stock RAMS
Applications ferroviaires –
Spécification et démonstration de la fiabilité,
de la disponibilité, de la maintenabilité
et de la sécurité (FDMS)
Partie 3: Guide pour l’application de l’EN 50126-1
à la fiabilité, la disponibilité, la maintenabilité
et la sécurité du matériel roulant

This Technical Report was approved by CENELEC on 2004-08-28.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50126-3:2006 E

Foreword
This Technical Report was prepared by Working Group B11 of SC 9XB, Electromechanical material on
board of rolling stock, of Technical Committee CENELEC TC 9X, Electrical and electronic applications for
railways.
The text of the draft was submitted to the formal vote and was approved by CENELEC as
CLC/TR 50126-3 on 2004-08-28.
This Technical Report forms an informative part of EN 50126 and contains guidelines for the application
of EN 50126-1 to Rolling Stock RAM.
__________
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Contents
Page
Introduction.5
1 Scope.6
1.1 Limitation of scope .6
2 Definitions .6
3 Approach adopted for the Guide.7
4 Application of this Guide .7
4.1 Object of the application.7
4.2 Application of EN 50126-1 .7
4.2.1 Assessment of the application of EN 50126-1.7
4.2.2 Mandatory requirements for the application of EN 50126-1.8
5 Specifying RAM requirements.8
5.1 Preliminary RAM analysis.8
5.1.1 Introduction.8
5.1.2 Preliminary RAM Analysis activities .9
5.1.3 System Identification.9
5.1.4 Breakdown structure and boundary limits .11
5.2 Failure conditions .12
5.3 RAM requirements.15
5.3.1 Introduction.15
5.3.2 Reliability Targets .15
5.3.3 Maintainability Targets.16
5.3.4 Availability Targets.20
5.4 Process for choosing RAM figures.23
5.5 RAM Programme.23
5.5.1 Introduction.23
5.5.2 Configuration Management System .23
5.5.3 RAM Programme Outline.24
5.5.4 Example of RAM Analyses Document Template and Data.25
6 RAM Assurance during Life Cycle.38
6.1 RAM Programme and Phases of the Life Cycle .38
6.1.1 Tender Phase.39
6.1.2 Design Phase.40
6.1.3 Demonstration Phase.43
7 Specific Hazards related to rolling stock .46
7.1 Introduction.46
7.2 Hazard Identification Process .46
7.3 List of the common hazards related to rolling stock.46

8 RAM Parameters to be incorporated into LCC Model.48
8.1 Introduction.48
8.2 Overview of LCC Modelling.48
8.3 RAM parameters for LCC.49
Annex A (informative) – Examples of breakdown structure.51
Bibliography.62

Table 1 Possible sharing of responsibility .5
Table 2 Example of header for a form representing a breakdown structure.12
Table 3 Example of minimum set of data representing a breakdown structure .12
Table 4 RAM Failure Categories .13
Table 5 Significant Failure Specification .14
Table 6 Major Failure Specification .14
Table 7 Minor Failure Specification .14
Table 8 Reliability Requirements for Failure Categories.16
Table 9 Quantitive Requirements for Maintainability.17
Table 10 Preventive/Corrective Maintenance Requirements.19
Table 11 Logistic Support Requirements .19
Table 12 Maintenance Cost Requirements.20
Table 13 Availability Requirements .22
Table 14 Example of header for RAM analyses Template.26
Table 15 Example of minimum set of data for Reliability Prediction sheets.26
Table 16 Example of minimum set of data for Preventive Maintenance sheets .29
Table 17 Example of minimum set of data for Corrective Maintenance sheets.33
Table 18 Example of minimum set of data for items FMECA sheets.35
Table 19 Description of the main tasks of Design Phase.41

Figure 1 Example of Reliability Prediction Analysis Sheet .27
Figure 2 Example of Preventive Maintenance Analysis Sheet.30
Figure 3 Example of Preventive Maintenance Sheet for a single frequency.32
Figure 4 Example of Corrective Maintenance Analysis Sheet .34
Figure 5 Example of items FMECA Sheet.36
Figure 6 Example of functions FMECA Sheet .37
Figure 7 RAM Programme and Life Cycle Phases.38
Figure 8 Possible relationships between Customer, Main Supplier, Sub-Supplier during
some phases of Life Cycle for rolling stock.39
Figure 9 Flow diagramme representing activities/documentations of Design Phase.41
Figure A.1 Example of structure using organisation chart for an Electrical Multiple Unit Coach.52
Figure A.2 Example of structure using the tree breakdown chart for an EMU
(Electrical Multiple Unit) Traction Vehicle.53
Figure A.1 Example of structure using the tree breakdown chart for an EMU
(Electrical Multiple Unit) Coach .59

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Introduction
EN 50126-1 is likely to enhance the general understanding of the issues involved in achieving RAMS
characteristics within the railway field. It defines a comprehensive set of tasks for the different phases of a
generic life cycle for a total rail system. Although some of the examples given in the annexes of
EN 50126-1 are for rolling stock, the standard is essentially aimed as a top level railway system
document.
RAMS characteristics for rolling stock (i.e. its long term operating behaviour performance), as for any
other system, forms an important part of its overall performance characteristics. But the consideration of
RAMS, in contractual terms, between a customer / operator and a Main Supplier for the procurement of
rolling stock has been problematic. Also, in rolling stock contracts, there is now a greater emphasis on the
impact on end customers of service failures and on the economic and risk considerations of RAMS
(i.e. the business perspective).
Consequently, Life Cycle Cost is being used as a measure of satisfying customer needs and providing a
wider perspective of RAM’s importance in terms of the business economics.
Life Cycle Cost approach represents a holistic, total cost of ownership philosophy for addressing the
economic considerations. The contribution of RAMS to the LCC of rolling stock could be used to allow the
economic considerations to be addressed.
This application guide focuses mainly on the procurement issues, from the tender to the operation phase,
and is intended to help in establishing a common approach for capturing the different, time dependant,
performance requirements of rolling stock from an operator/business perspective.
EN 50126-1 is a standard, which treats the overall aspects of RAMS in Railway Applications. This guide
deals with the application of RAM
...