This document applies within the framework of standard prEN 15085. As an integral of the above-mentioned standard, its scope covers design and calculation rules applicable to the building and welding repairs of railway vehicles and constituent items thereof. As regards the welding of metals, acceptance authority prescribe performances applicable to finished weldments; they do not prescribe welding methods. The manufacturer has full freedom to select whichever welding process, consumables and edge preparation he wishes to implement. However, customers may contractually restrict the use of certain welding processes. In return, upon customer request, the manufacturer is to demonstrate, in particular through the following, i.e.: - company qualification, - welder and welding operator qualification, - welding process and mock-up qualification, that they have full control and that the quality level requested by customers will be achieved. As regards drawings issued prior to this standard, the prescriptions laid down herein may be applied. The manufacturer shall inform their customers beforehand. Note: This standard does not deal with product qualification (refer to other standards for fatigue mock-ups for instance).