CPV code 34631400 designates Wheel axles and tyres and other parts of locomotives or rolling stock in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
34631400 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 34631000 (Parts of locomotives or rolling stock).