Railway applications —The specification and
demonstration of Reliability,Availability,
Maintainability and Safety (RAMS) —
Part 3: Guide to the application of
EN 50126-1 for rolling stock RAM
This document provides guidance on applying the RAM requirements in EN 50126-1 to rolling stock and
for dealing with RAM activities during the system life cycle phases from invitation to tender to
demonstration in operation only. All references to EN 50126-1 concern the version of 1998.
The guide is aimed at the customers/operators and main suppliers of rolling stock. The main purpose of
the guide is to:
• enable a customer/operator of rolling stock:
− to specify the RAM requirements addressing the type of operation in terms of the end customer
needs, considering service availability and economic considerations;
− to evaluate different tenders, in terms of RAM requirements, on a common basis with the aid of
specific RAM documents;
− to gain assurance, during design/development phase, that the rolling stock being offered is
likely to satisfy the RAM contractual requirements by examining step by step detailed and
specific RAM documents as an output of the RAM activities performed during the development
phase;
− to validate that the rolling stock, as delivered, satisfies the specified RAM requirements
• to enable the main supplier of rolling stock
− to understand the customers/operators RAM requirements
− to provide substantive information/visibility in a tender to show that the product offered is likely
to satisfy the RAM requirements by performing preliminary RAM analysis;
− to provide substantive information during design/development phase to show that the product
offered is likely to satisfy the RAM requirements by performing detailed RAM analysis;
− to demonstrate that the product delivered satisfies the RAM requirements;
Regarding LCC, this application guide is restricted to providing only the key RAM parameters necessary
to be incorporated into an LCC Model.
This application guide excludes:
• RAM values connected to the different RAM requirements (however, it contains a simple guide line
of actions for supporting the decision making process and choosing appropriate values, see 5.4)
• specific RAM documents to be produced and activities to be performed. However, it provides, only
as an example, typical data and document templates for recording the output of a RAM analysis).