FprEN 18141

SLOVENSKI STANDARD
01-januar-2025
Železniške naprave - Zavore - Gumb za klic v sili
Railway applications - Braking - Emergency push button
Bahnanwendungen - Bremsen - Notbremsschlagknopf
Applications ferroviaires - Freinage - Bouton poussoir d'urgence
Ta slovenski standard je istoveten z: prEN 18141
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 18141
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2024
ICS 45.040
English Version
Railway applications - Braking - Emergency push button
Applications ferroviaires - Freinage - Bouton poussoir Bahnanwendungen - Bremsen - Notbremsschlagknopf
d'urgence
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
If this draft becomes a European Standard, CEN 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 CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18141:2024 E
worldwide for CEN national Members.

prEN 18141:2024 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols and abbreviations . 6
5 Requirements . 6
5.1 Functional requirements . 6
5.1.1 General. 6
5.1.2 Emergency push button as emergency brake demand device only . 6
5.1.3 Emergency push button including emergency brake demand device and trainwide
emergency brake control device . 7
5.2 Operating conditions . 7
5.2.1 Shock and vibration . 7
5.2.2 Altitude . 7
5.2.3 Ambient temperature. 7
5.2.4 Humidity . 7
5.2.5 Solar radiation . 7
5.2.6 Pollution . 8
5.2.7 Specific requirements for pneumatic parts of emergency push buttons . 8
5.2.8 Specific requirements for electrical parts of emergency push buttons . 8
5.3 Design requirements . 8
5.3.1 External appearance . 8
5.3.2 Application and release forces . 9
5.3.3 Stroke of the push button. 9
5.3.4 Fire/smoke behaviour . 9
5.3.5 Pneumatic connections . 9
5.3.6 Installation constraints and recommendations . 9
6 Type test methods . 10
6.1 Sampling for type test . 10
6.2 Test requirements . 10
6.3 Test procedure . 10
6.3.1 Principle . 10
6.3.2 Check of physical and geometrical characteristics . 11
6.3.3 Application/release control . 11
6.3.4 Vibration test . 12
6.3.5 Resistance to shock test . 13
6.3.6 Endurance at ambient temperature test . 13
6.3.7 Corrosion test . 14
6.3.8 Fire/smoke behaviour . 15
6.3.9 Examination . 15
6.3.10 Pressure test (water pressure) . 15
6.3.11 Tightness and exhaust performance test . 15
6.3.12 Insulation test . 16
6.3.13 Dielectric strength . 16
prEN 18141:2024 (E)
7 In-service assessment . 16
8 Marking . 16
Annex A (normative) Dimensions, shape and colour of the mushroom button . 17
Annex B (informative) In-service assessment . 19
Bibliography . 20

prEN 18141:2024 (E)
European foreword
This document (prEN 18141:2024) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
prEN 18141:2024 (E)
1 Scope
This document specifies the requirements for the function, design, performance, and testing of
emergency push buttons that are installed in train’s driving’s cab.
This document is applicable for emergency push button.
This document is not applicable for emergency handle.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14198:2016+A2:2021, Railway applications - Braking - Requirements for the brake system of trains
hauled by locomotives
EN 45545-2:2020+A1:2023, Railway applications - Fire protection on railway vehicles - Part 2:
Requirements for fire behaviour of materials and components
EN 50121-3-2:2016, Railway applications — Electromagnetic compatibility — Part 3-2: Rolling stock —
Apparatus
EN 50125-1:2014, Railway applications - Environmental conditions for equipment - Part 1: Rolling stock
and on-board equipment
EN 50155:2021, Railway applications - Rolling stock - Electronic equipment
EN 60721-3-5:1997, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 5: Ground vehicle installations (IEC 60721 3
5:1997)
EN 61373:2010, Railway applications - Rolling stock equipment - Shock and vibration tests (IEC
61373:2010)
EN ISO 228-2:2003, Pipe threads where pressure-tight joints are not made on the threads - Part 2:
Verification by means of limit gauges (ISO 228-2:1987)
EN ISO 24478:2024, Railway applications - Braking - General vocabulary (ISO 24478:2023, including
corrected version 2024-04)
EN ISO 6270-2:2018, Paints and varnishes - Determination of resistance to humidity - Part 2: Condensation
(in-cabinet exposure with heated water reservoir) (ISO 6270-2:2017)
EN ISO 9227:2022, Corrosion tests in artificial atmospheres —Salt spray tests (ISO 9227:2022)
ISO 5208:2015, Industrial valves — Pressure testing of metallic valves
ISO 4975:2022, Railway applications — Braking system — Quality of compressed air for pneumatic
apparatus and systems
As impacted by EN 50121-3-2:2016/A1:2019.
As impacted by EN ISO 9227:2022/A1:2024.
prEN 18141:2024 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 24478:2024 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
emergency push button
emergency brake demand device fitted with a red mushroom button for the driver that is independent
and separated from other driver’s brake demand device
Note 1 to entry: This device can also function as an emergency brake trainwide control device.
[SOURCE: EN ISO 24478:2024, 3.10.1.8, modified — admitted term “emergency handle” deleted, Note 1
to entry moved to definition.]
3.2
mushroom button
part of the emergency push button in interface with the driver with a shape of mushroom
4 Symbols and abbreviations
For the purposes of this document, the following symbols in Table 1 apply.
Table 1 — Symbols
Symbol Description Unit
U Nominal voltage V
n
DC Direct current —
5 Requirements
5.1 Functional requirements
5.1.1 General
Only two positions shall be possible for the emergency push button: “no emergency brake application
demanded” and “emergency brake application demanded”. These two positions shall be notched.
Switching from “no emergency brake application demanded” to “emergency brake application
demanded” shall be done by pushing on the mushroom button.
Switching from “emergency brake application demanded” to “no emergency brake application
demanded” shall be done by pulling the mushroom button.
5.1.2 Emergency push button as emergency brake demand device only
The emergency brake demand signal shall be controlled directly by the position of the mushroom button.
prEN 18141:2024 (E)
The emergency brake demand signal controlled by the emergency push button shall be in accordance
with the principle “deactivate-to-apply”, i.e. no signal shall mean “emergency brake application
demanded”.
5.1.3 Emergency push button including emergency brake demand device and trainwide
emergency brake control device
The trainwide emergency brake control signal controlled by the trainwide emergency brake control
device of the emergency push button shall be mechanically linked to the position of the mushroom button.
5.2 Operating conditions
5.2.1 Shock and vibration
The emergency push button shall be able to operate without restriction under shock and vibration
conditions as specified in EN 61373:2010, category 1, class B, body mounted. This shall be tested in
accordance with 6.3.4 and with 6.3.5.
5.2.2 Altitude
The emergency push button shall be able to operate without restrictions up to an altitude of 2 000 m
above sea level.
5.2.3 Ambient temperature
The emergency push button shall be able to operate within the temperature class TX as specified by
EN 50125-1:2014, where the upper limit for TX is +70 °C external air temperature. This requirement shall
be tested in accordance with 6.3.
5.2.4 Humidity
The following external humidity levels shall be considered:
— yearly average: ≤ 75 % relative humidity;
— on 30 days in the year continuously: between 75 % and 95 % relative humidity;
— on the other days occasionally: between 95 % and 100 % relative humidity;
— maximum absolute humidity: 30 g/m occurring in tunnels.
An operationally caused infrequent and slight moisture condensation shall not lead to any malfunction
or failure.
At cooled surfaces, 100 % relative humidity can occur, causing condensation on parts of equipment; this
shall not lead to any malfunction or failure.
Sudden lowering of the air temperature local to the vehicle can cause condensation of water on parts of
equipment with rate of 3 K/s and maximum fall in temperature of 40 K.
These conditions particularly occurring when entering or leaving a tunnel shall not lead to any
malfunction or failure of the equipment.
To withstand the external corrosion due to normal atmospheric pollutants as specified in
EN 50125-1:2014, the emergency push button shall be tested in accordance with 6.3.7.
5.2.5 Solar radiation
Equipment design shall allow for direct exposure to solar radiation in accordance with the class R2 of
EN 50125-1:2014, 4.9 for parts exposed (e.g. mushroom button).
prEN 18141:2024 (E)
5.2.6 Pollution
The effects of pollution shall be considered in the design of equipment and components. The effects of the
kinds of pollution indicated in Table 2 shall be considered as a minimum.
Table 2 — Pollution
Pollution Requirements
Chemically active substances Class 5C2 of EN 60721-3-5:1997
Contaminating fluids Class 5F2 (electrical engine) of EN 60721-3-5:1997
Class 5F3 (thermal engine) of EN 60721-3-5:1997
Biologically active substances Class 5B2 of EN 60721-3-5:1997
Dust Class 5S2 of EN 60721-3-5:1997
Sand Class 5S2 of EN 60721-3-5:1997
Sea spray Class 5C2 of EN 60721-3-5:1997
Compatibility of a cleaning product should be considered in the design of equipment.
5.2.7 Specific requirements for pneumatic parts of emergency push buttons
To respect the upper pressure limit of the compressed air supply of 10 bar, the emergency push button
shall be able to withstand a hydraulic test with a pressure of 15 bar in accordance with 6.3.10.
It shall be possible to operate the pneumatic parts of emergency push buttons without restrictions with
at least the compressed air purity 3-3-4 [−25 °C; 50 °C] in accordance with ISO 4975:2022.
When not activated, the loss of pressure of the emergency push button at 5,0 bar shall be less than
0,005 Nl per minute for temperature between 0 °C and 40 °C and less than a value defined linearly from
0,005 Nl to 0,10 Nl between 0 °C and −40 °C, and between 40 °C and 70 °C.
When used with degraded compressed air purity 3-6-4 [−25 °C; 50 °C] in accordance with ISO 4975:2022,
the loss of pressure of the emergency push button at 5,0 bar shall be less than two times the one allowed
with the air purity 3-3-4 [−25 °C; 50 °C] in accordance with ISO 4975:2022.
If emergency push button includes a pneumatic trainwide emergency brake control device, when
activated, the emergency push button shall have the same exhaust performance as the emergency brake
application of EN 14198:2016+A2:2021, Clause E.4 for both air purities 3-3-4 and 3-6-4. These
performances shall be tested in accordance with 6.3.11.
5.2.8 Specific requirements for electrical parts of emergency push buttons
The electrical parts of emergency push buttons shall be in conformity with the requirements of
EN 50155:2021 and EN 50121-3-2:2016 , if applicable. These performances shall be tested in accordance
with 6.3.12 and 6.3.13
When the voltage supply is at upper and lower limit the emergency push button shall be able to withstand
the temperature range in accordance with 6.3.3.
5.3 Design requirements
5.3.1 External appearance
The
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