BS EN 13674-4:2019 pdf free. Railway applications – Track – Rail. Part4:Vignole railway rails from 27 kg/m to, but excluding 46 kg/m.
This Introduction provides an explanation of the concepts and reasoning used in the drafting of this document. Its inclusion also ensures that during future revisions, restrictions are removed where technology progresses and held where it does not, thus ensuring continued safety as new manufacturers, products and technologies are introduced.
The most commonly used standards of the world for the supply of railway rails have been reviewed during the preparation of this document. However, modern rail production technology within the European Union has demanded a completely new look at the philosophy and content of this part of EN 13674.
Whenever possible this part of EN 13674 is performance based, recognizes the European Quality System standard EN ISO 9001 and requires manufacturers to offer the latest proven technology to consistently satisfy the demanding quality of the required product.
Rail grading is based on hardness rather than tensile strength.
The acceptance tests have been designed to control those characteristics of the rail steel and rail that are of relevance to the production of high quality rails and the demands of the railway.
The steel grades covered by this part of EN 13674 reflect trends in railway usage and heat-treated rails are included. This document includes rail profiles for Vignole rails having a linear mass from 27 kg/rn to, but excluding 46 kg/rn.
This document supersedes national standards covered by the Scope. In addition CEN required, where possible, a performance based standard, taking into account safety implications and at the same time addressing modern production technology. It was recognized that there would be few opportunities (and these would have to be for transparent safety considerations) for derogation from this document to operate between the user and the manufacturer.
BS EN 13674-4 reflects this change in philosophy from the traditional content of rail standards. A review was undertaken of the most commonly used rail standards of the world. All relevant aspects important to both user and manufacturer were considered with the aim of ensuring that all of the content had specific usefulness and relevance. For example rail grading and much of this document has been based on hardness rather than tensile strength. While the two are directly related, hardness is very quick and cheap to carry out and provides more relevant guidance to the user particularly where properties vary in different parts of the profile.
Since many rail manufacturers would not have previously carried out proving trials, this document includes a prerequisite for all manufacturers to prove conformity against a set of qualifying test criteria at the time of tendering. The qualifying tests include all “normal” acceptance test results plus new ‘typecasting’ features such as fracture toughness, fatigue and residual stress (see EN 13674-1). To provide users with the necessary confidence, acceptance limits have been based on results from rail known to have performed well in demanding track installations.BS EN 13674-4 pdf download.