This paper brings into focus the metro rail network extensiveness versus city’s needs based on a set of meaningful indicators resulted from research and analysis of successful and “mature” metro rail networks in Europe. On that purpose, a set of selected indicators relating metro network elements and main city characteristics are developed. Subsequently, these indicators are applied in order to estimate the degree of adequacy of Athens metro network according to city’s needs. Once the adequacy ofAthens’s metro network is formulated, specific proposals are presented concerning the network length, as well as the respective number of metro stations, that Athens should develop in the long-run in order to serve citizens’ transportation needs for the next decades.