Due for completion in early 2019, the project will extend the line 1.7km from Fehérvári út to a new four-track terminus at Etele tér adjacent to Kelenföld main line station and the terminus of metro Line 4.

The Forints 8.63bn ($US 32.5m) project is 98.5%-funded by the European Union.

In addition to the extension, the project encompasses the rebuilding of the 1.6km Győrffy utca - Mester utca section of Line 1.