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prEN 50121-2:2025

(Main)

Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole railway system to the outside world

Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole railway system to the outside world

This document is intended to define the electromagnetic environment of the whole railway system including urban mass transit and light rail system. It describes the measurement method to verify the emissions, and gives the cartography values of the fields most frequently encountered. This document specifies the emission limits of the whole railway system to the outside world. The emission parameters refer to the particular measuring points defined in Clause 5. These emissions should be assumed to exist at all points in the vertical planes which are 10 m from the centre lines of the outer electrified railway tracks, or 10 m from the fence of the substations. Also, the zones above and below the railway system may be affected by electromagnetic emissions and particular cases need to be considered individually. These specific provisions need to be used in conjunction with the general provisions in EN 50121-1. For existing railway lines, it is assumed that compliance with the emission requirements of EN 50121-3-1, EN 50121-3-2, EN 50121-4 and EN 50121-5 will ensure the compliance with the emission values given in this part. For newly built railway systems it is best practice to provide compliance to the emission limits given in this part of the standard (as defined in the EMC plan according to EN 50121-1).

Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 2 Störaussendungen des gesamten Bahnsystems in die Außenwelt S

Applications ferroviaires - Compatibilité électromagnétique – Partie 2 Emission du système ferroviaire dans son ensemble vers le monde extérieur

Železniške naprave - Elektromagnetna združljivost - 2. del: Sevanje celotnega železniškega sistema v okolje

General Information

Status
Not Published
Publication Date
15-Sep-2026
ICS
29.280 - Electric traction equipment
33.100.10 - Emission
45.020 - Railway engineering in general
Technical Committee
CLC/TC 9X - Electrical and electronic applications for railways
Drafting Committee
CLC/TC 9X/WG 18 - Railway application -- Electromagnetic compatibility (EMC)
Current Stage
4010 - Start of preparation of Enquiry - Enquiry
Start Date
05-Jun-2025
Completion Date
29-May-2025
Ref Project
oSIST prEN 50121-2:2025 - Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole railway system to the outside world

Relations

Revises
EN 50121-2:2017 - Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole railway system to the outside world
Effective Date
09-Apr-2024

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SLOVENSKI STANDARD
01-september-2025
Železniške naprave - Elektromagnetna združljivost - 2. del: Sevanje celotnega
železniškega sistema v okolje
Railway applications - Electromagnetic compatibility - Part 2: Emission of the whole
railway system to the outside world
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 2 Störaussendungen des
gesamten Bahnsystems in die Außenwelt S
Applications ferroviaires - Compatibilité électromagnétique – Partie 2 Emission du
système ferroviaire dans son ensemble vers le monde extérieur
Ta slovenski standard je istoveten z: prEN 50121-2:2025
ICS:
33.100.10 Emisija Emission
45.020 Železniška tehnika na Railway engineering in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN 50121-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 29.280; 33.100.10; 45.020 Will supersede EN 50121-2:2017
English Version
Railway applications - Electromagnetic compatibility - Part 2:
Emission of the whole railway system to the outside world
Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -
Partie 2 Emission du système ferroviaire dans son Teil 2 Störaussendungen des gesamten Bahnsystems in
ensemble vers le monde extérieur die Außenwelt S
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2025-10-24.

It has been drawn up by CLC/TC 9X.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

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

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79748 Ref. No. prEN 50121-2:2025 E

1 Contents Page
2 European foreword . 4
3 1 Scope . 6
4 2 Normative references . 6
5 3 Terms definitions and abbreviations . 6
6 3.1 Terms and definitions . 6
7 3.2 Abbreviations . 7
8 4 Emission limits . 7
9 4.1 Emission from the open railway system during train operation . 7
10 4.2 Radio frequency emission from railway substations . 8
11 5 Method of measurement of emission from moving rolling stock and substations . 8
12 5.1 General and specific measurement parameters . 8
13 5.1.1 General measurement parameters . 8
14 5.1.2 Measurement locations . 10
15 5.1.3 Measurement parameter for moving trains . 11
16 5.1.4 Measurement parameter for railway substations . 11
17 5.2 Acquisition method . 12
18 5.3 Transients . 12
19 5.4 Measuring conditions . 12
20 5.4.1 Weather conditions . 12
21 5.4.2 Railway system operating modes . 12
22 5.4.3 Multiple sources from remote trains . 12
23 5.5 Test report . 12
24 Annex A (informative) Background to the method of measurement . 18
25 A.1 Introduction . 18
26 A.2 Requirement for a special method of measurement . 18
27 A.3 Justification for a special method of measurement . 18
28 A.4 Frequency range . 19
29 A.5 Antenna positions . 19
30 A.6 Conversion of results if not measured at 10 m . 19
31 A.7 Measuring scales . 19
32 A.8 Repeatability of results . 20
33 A.9 Railway system conditions . 20
34 A.9.1 Weather . 20
35 A.9.2 Speed, traction power . 20
36 A.9.3 Multiple sources from remote trains . 20
37 A.10 Number of traction vehicles per train . 20
38 Annex B (informative) Cartography — Electric and Magnetic fields at traction frequencies . 21
39 Annex C (informative) Emission values for lower frequency range . 23
40 Bibliography . 26
42 European foreword
43 This document (prEN 50121-2:2025) has been prepared by CLC/TC 9X “Electrical and electronic applications
44 for railways”.
45 This document is currently submitted to the Enquiry.
46 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
47 This document has been prepared according to Decision 69/09 taken during the TC 9X meeting.
48 This document will supersede EN 50121-2:2017.
49 prEN 50121-2:2025 includes the following significant technical change with respect to EN 50121-2:2017:
50 — clarification of scope, last paragraph;
51 — update of normative references;
52 — clarification in definition 3.1.2 and new definition 3.1.5;
53 — clarification in Clause 4.1 Emission from the open railway system during train operation;
54 — additional information included in Clause 5.1.1.4 Measurement distance and height;
55 — update of Clause 5.1.2 Measurement locations;
56 — addition of last bullet point in Clause 5.1.3 Measurement parameters for moving trains;
57 — addition of last bullet point in Clause 5.1.4 Measurement parameters for railway substations;
58 — update of Clause 5.2 Acquisition method;
59 — update of Clause 5.4.2 Railway system operating modes;
60 — update of Figures 1 and 2;
61 — addition in informative Annex A, A.5 Antenna positions;
62 — update of informative Annex A, A.10 Number of traction vehicles per train;
63 — update of informative Annex C.
64 This document is read in conjunction with prEN 50121-1:2025.
65 EN 50121, Railway applications — Electromagnetic compatibility, consists of the following parts:
66 — Part 1: General;
67 — Part 2: Emission of the whole railway system to the outside world [the present document];
68 — Part 3-1: Rolling stock — Train and complete vehicle;
69 — Part 3-2: Rolling stock — Apparatus;
70 — Part 4: Emission and immunity of the signalling and telecommunications apparatus;
71 — Part 5: Emission and immunity of fixed power supply installations and apparatus.
72 1 Scope
73 This document is intended to define the electromagnetic environment of the whole railway system including
74 urban mass transit and light rail systems. It describes the measurement method to verify the emissions and
75 gives the cartography values of the fields most frequently encountered.
76 This document specifies the emission limits of the whole railway system to the outside world.
77 The emission parameters refer to the particular measuring points defined in Clause 5.
78 Also, the zones above and below the railway system can be affected by electromagnetic emissions and
79 particular cases need to be considered individually.
80 For existing railway systems, it is assumed that compliance with the emission requirements of
81 prEN 50121-3-1:2025, prEN 50121-3-2:2025, prEN 50121-4:2025 and prEN 50121-5:2025 will ensure the
82 compliance with the emission values given in this part.
83 This document gives emission limits for newly built railway systems (not yet in operation) with different
84 characteristics (e.g. higher design speed of the line, static switching components) in comparison with existing
85 railway systems.
86 2 Normative references
87 The following documents are referred to in the text in such a way that some or all of their content constitutes
88 requirements of this document. For dated references, only the edition cited applies. For undated references, the
89 latest edition of the referenced document (including any amendments) applies.
90 EN IEC 55016-1-1:2019, Specification for radio disturbance and immunity measuring apparatus and methods -
91 Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus (CISPR 16-1-1:2019)
92 EN IEC 55016-1-4:2019 , Specification for radio disturbance and immunity measuring apparatus and
93 methods — Part 1-4: Radio disturbance and immunity measuring apparatus — Antennas and test sites for
94 radiated disturbance measurements (CISPR 16-1-4:2019 + A1:2020)
95 IEC 60050-161:1990, International Electrotechnical Vocabulary — Chapter 161: Electromagnetic compatibility
96 3 Terms definitions and abbreviations
97 3.1 Terms and definitions
98 For the purposes of this document, the terms and definitions given in IEC 60050-161:1990 and the following
99 apply.
100 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
101 — ISO Online browsing platform: available at https://www.iso.org/obp/
102 — IEC Electropedia: available at https://www.electropedia.org/
103 3.1.1
104 apparatus
105 device or assembly of devices which can be used as an independent unit for specific functions
106 [SOURCE: IEC 60050-151:2001, 151-11-22]
107 3.1.2
...

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