CEN/TC 256/SC 3/WG 25 - Terminology, calculations, homologation procedures

This European Standard specifies generic static tests requirements for the braking systems for all types of railways vehicles. Hereinafter all references to tests are to be read as “static” tests.
The methods of test and acceptance criteria are described in the appropriate standards (as example, for High speed trains, FprEN 15734-1 and FprEN 15734-2 apply).
Static tests conducted in normal service before the departure of the train are not considered in this standard.
This European Standard is applicable to brake systems on:
-   all new vehicle designs of vehicles;
-   all new constructions of existing vehicle types;
-   all major overhauls of the above-mentioned vehicles if they involve redesigning or extensive alteration to the brake system of the vehicle concerned.
This European Standard does not apply to special transport systems (suspended monorail, rack and pinion lines, etc.), nor to investigative and supplementary tests.
Annex A presents the components and sub-systems to be incorporated in the brake system considered.

This document defines the meaning of the common terms in use in the field of railway rolling stock brakes and braking. It includes some terms where the principal function of the system or component is other than braking. Systems, subsystems and components not located in the train are excluded.

This European Standard describes a general algorithm that may be used in all types of high speed
and conventional vehicle applications, including self-propelling thermal or electric trains, thermal or
electric traction units; passenger carriages, mobile railway infrastructure construction and
maintenance equipment and freight wagons. This standard does not specify the performance
requirements. It enables the calculation of the various aspects of the performance: stopping or
slowing distances, dissipated energy, force calculations and immobilization braking.
This standard enables the verification by calculation of the stopping, slowing and immobilization
performance requirements for high speed and conventional trains operating on high speed and
conventional infrastructure.
This standard presents:
a) example of distance and other dynamic calculations, see Annex C;
b) example of immobilisation calculations, see Annex D.

This document specifies a general algorithm to be used in any type of vehicle application. It enables the calculation of the various aspects of the performance: stopping or slowing distances, dissipated energy, force calculations, immobilization braking.
Typical examples of calculations for freight wagon, coach and locomotive are given in Parts 2 to 6 of this European Standard.
NOTE   This document does not specify the performance requirements which can be found in the different standards specified in Clause 2.
This document enables the verification that the design respects the requirements according to the railway application type.