[1] Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy
[2] Univ Naples Federico II, Dept Econ & Stat, Naples, Italy
[3] Apeleona Italy SpA, Milan, Italy
[4] Ferrovie Stato Italiane, Milan, Italy
[5] Univ Naples Federico II, Dept Social Sci, Naples, Italy