CPV code 51611120 designates Installation services of railway real-time departures and arrival display screens or boards in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
51611120 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 51611100 (Hardware installation services).