45234122 - Underground railway works

CPV code 45234122 in the EU Common Procurement Vocabulary refers to Underground railway works. It sits at level 6 of the CPV hierarchy as a subcategory within the 45 division. This code is nested directly under 45234100, narrowing the broader category into the specific area of underground railway works. As a leaf code, 45234122 has no further subdivisions and represents the most precise classification available in this branch — buyers should reference it directly in tender notices when the procurement primarily concerns underground railway works. Contracting authorities across the EU use 45234122 in TED notices and national procurement portals to signal that a tender relates to underground railway works.