EN 16452:2015/FprA1

SLOVENSKI STANDARD
SIST EN 16452:2015/oprA1:2017
01-junij-2017
äHOH]QLãNHQDSUDYH=DYRUH=DYRUQHSORãþLFH
Railway applications - Braking - Brake blocks
Bahnanwendungen - Bremse - Bremsklötze
Applications ferroviaires - Freinage - Semelles de frein
Ta slovenski standard je istoveten z: EN 16452:2015/prA1:2017
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 16452:2015/oprA1:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 16452:2015/oprA1:2017
SIST EN 16452:2015/oprA1:2017
DRAFT
EUROPEAN STANDARD
EN 16452:2015
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
April 2017
ICS 45.040; 45.060.01
English Version
Railway applications - Braking - Brake blocks
Applications ferroviaires - Freinage - Semelles de frein Bahnanwendungen - Bremse - Bremsklötze
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 256.

This draft amendment A1, if approved, will modify the European Standard EN 16452:2015. If this draft becomes an amendment,
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration.

This draft amendment 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16452:2015/prA1:2017:2017 E
worldwide for CEN national Members.

SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
Contents Page
European foreword . 3
1 Modifications to 7.3, Static friction coefficient . 4
2 Modifications to 7.4.2, Dynamometer test . 4
3 Modifications to 7.4.3, Train brake test . 5
4 Modifications to Annex J, Dynamometer test program – Generic test program . 5
5 Modifications to Annex M, Test run to demonstrate the extreme winter braking
properties brake blocks K – LL for freight wagons . 7
6 Modifications to Annex Q, Dynamometer test program – Determination of static
friction coefficient . 12
7 Modifications to Annex T, Brake block shear and flexural strength tests . 13

SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
European foreword
This document (EN 16452:2015/prA1:2017) 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.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive 2008/57/EC.
For relationship with EU Directive 2008/57/EC, see informative Annex ZA of EN 16452:2015, which is
an integral part of this document.
SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
1 Modifications to 7.3, Static friction coefficient
In Table 6, replace:
“Q.1” by “Q.2”, “Q.2” by “Q.3”and “Q.3” by “Q.4”.
In the last sentence of this subclause, replace “Q.1” by “Q.2”.
2 Modifications to 7.4.2, Dynamometer test
Replace the current subclause 7.4.2 with the following:
"7.4.2 Dynamometer test
7.4.2.1 Test program to demonstrate the braking properties under severe snowy conditions
The dynamometer test program to demonstrate the extreme winter braking properties is set out in L.1
and L.2 and is only applicable if the friction element:
a) is intended to be used in subsystems which fall under the following scope:
1) nominal wheel diameters of 680 mm to 920 mm;
2) friction element configuration;
i) 1Bg (if the test was performed in configuration 1Bg or 2Bgu);
ii) 1Bgu (if the test was performed in configuration 1Bgu or 2Bgu);
iii) 2Bg (if the test was performed in configuration 2Bg or 2Bgu);
iv) 2Bgu (if the test was performed in configuration 2Bgu);
3) mass per wheel ≥ 1,8 t.
b) complies with one of the following cases of the mean dynamic friction coefficient as determined in
accordance with J.4:
Table 7 — Cases of the mean dynamic friction coefficient
Total F per wheel Initial speed
B
Mean dynamic friction
Case F v
B
coefficient
kN km/h
1 0,28 < µ < 0,32 9 100
m
2 0,27 < µ < 0,31 9 120
m
3 0,17 < µ < 0,19 16 100
m
4 0,16 < µ < 0,18 16 120
m
SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
To demonstrate the extreme winter braking properties of friction elements complying with cases 1 and
2 of Table 5, the test program of L.1 shall be applied; for friction elements complying with cases 3 and 4
of Table 5, the test program of L.2 shall be applied.
7.4.2.2 Values to be determined in order to define the area of use
The test program shall be carried out three times and the establishment of the suitability shall be done
for a maximum test speed of 100 km/h and 120 km/h as follows:
— For a maximum speed of 100 km/h the deviation of the average value of the measured stopping
distances s under snow (brake application No 29, 33, 37, 42 and 46 of L.1 or L.2) from the average
value of the measured stopping distances s under dry conditions (brake application No 16, 18, 20,
22 and 24 of L.1 or L.2) shall be determined.
— For a maximum speed of 120 km/h the deviation of the average value of the measured stopping
distances s1 under snow (brake application No 31, 35, 39, 44 and 48 of L.1 or L.2) from the average
value of the measured stopping distances s under dry conditions (brake application No 17, 19, 21,
23 and 25 of L.1 or L.2) shall be determined.
7.4.2.3 Pass/fail criteria
The pass/fail criteria shall conform to the ones defined in L.4.
For the brake blocks design for area of use corresponding at S and/or SS wagons if the dynamometer
test is performed in brake block configuration 2Bgu, a positive assessment also applies to the other
brake block configurations.".
3 Modifications to 7.4.3, Train brake test
Replace the text in subclause 7.4.3 with the following:
"The winter friction properties shall be assessed in conformity with prescriptions of Annex M; pass/fail
criteria shall conform to the ones defined in M.4.
M.1 Test program to demonstrate the braking properties under severe snowy conditions.
M.2 Values to be determined in order to define the area of use.
M.3 Assessment of measurement data and pass/fail criteria.
The variation between the average of braking distances for every speed range of 85 % of maximum
speed and maximum speed in winter condition and in reference condition shall not exceed 10 %.
For the brake blocks design for area of use corresponding at S and/or SS wagons if the test run is
performed in brake block configuration 2Bgu, a positive assessment also applies to the other brake
block configurations.".
4 Modifications to Annex J, Dynamometer test program – Generic test program
In the title of Annex J, replace "informative" by "normative".
In subclause J.1, in the second sentence, replace: "This principle can be applied for design a test program"
by
"This principle shall be applied for design a test program”.
SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
Add a new subclause J.4 as follows:
"J.4 Values to be determined in order to define the area of use
The values for the following parameters shall be determined and recorded within the area of use:
a) Tested configuration consisting of:
1) friction element arrangement,
2) wheel type,
3) nominal and tested wheel diameter.
b) Mean dynamic friction coefficient of non-bedded and bedded state. The mean dynamic friction
coefficient of the non-bedded and bedded state are defined as the average of the first 5 and the last
5 measured values of brake application No 1.1 to 1.X.
c) Mean dynamic friction coefficient under dry conditions versus the initial operating speed v for the
different brake forces F applied and the mass to brake per wheel m using the template diagrams
B
set out in Table J.2.
Table J.2 — Template diagrams and allocated brake application No

Brake application Brake application Brake application
No 31 to 34 and 43 to 46 No 27 to 30 and 39 to 42 No 35 to 38 and 47 to 50

Brake application Brake application Brake application
No 101 to 104 and 113 to 116 No 97 to 100 and 109 to 112 No 105 to 108 and 117 to 120
SIST EN 16452:2015/oprA1:2017
EN 16452:2015/prA1:2017 (E)
d) Mean dynamic friction coefficient variation under wet conditions. The variation shall be expressed
as the averages of the measured mean dynamic friction coefficients under wet conditions (brake
application No 52 to 95) in proportion to the corresponding averages of mean dynamic friction
coefficients under dry conditions (brake application No 27 to 50, 105 to 108 and 117
...