19/30389695 DC

This document defines the requirements for buffers with 105mm, 110mm and 150mm stroke for vehicles or units which use buffers and screw coupling. It covers the functionality, interfaces and testing procedures, including pass fail criteria, for buffers. NOTE1Typically, buffers with a stroke of 105mm are used on freight wagons and locomotives, buffers with a stroke of 110mm are used on coaches and locomotives and buffers with a stroke of 150mm are used on freight wagons. It defines the different categories of buffers, the space envelope, static and dynamic characteristics and energy absorption. It defines the static and dynamic characteristics of the elastic systems. It also defines the requirements for buffers with integrated crash elements (crashworthy buffers) for tank wagons for dangerous goods. The requirements of this document also apply to buffers of locomotives and passenger coaches which are bound to meet the crashworthiness requirements of EN15227 for normal service only. The properties for the energy absorbing function are defined in EN15227 and the requirements specified in Clause7 for tank wagons for dangerous goods are not applicable to the buffers of these locomotives and passenger coaches. Diagonal buffers are excluded from this document. For the crashworthy buffers of locomotives, cab cars or passenger coaches according to EN15227, and tank wagons for dangerous goods or buffers which form part of a combined system consisting of a special buffer and a deformation element, interchangeability with freight wagon buffers is not required, and therefore the requirements of 5.3 (Buffer dimensions) do not apply, those of 5.4 (Mechanical characteristics of buffers) and 5.6 (Marking) apply with restrictions. NOTE2For tank wagons subjected to dangerous goods regulation see[35].