This European Standard specifies principles and requirements for measuring bogies with 2 wheelsets. This ensures that the measuring processes are applied in accordance with uniform criteria. It applies to new and modified bogies with 2 wheelsets. Provisions going beyond the scope of these requirements are generally agreed between the contracting parties involved. The measuring processes relate to the bogies with or without add-ons in their entirety or just part of them if the geometrical structure does not permit anything else. Where appropriate, other measuring processes not specified here are necessary and are specified in each individual case.