[1] Univ Valladolid, Dept Elect Engn, Res Grp Predict Maintenance & Testing Elect Machi, E-47011 Valladolid, Spain
[2] Univ Valladolid, Dept Stat & Operat Res, E-47011 Valladolid, Spain
[3] CIDAUT Fdn, Light Alloys Div, Valladolid 47151, Spain
[4] Renfe Operadora, Madrid 28036, Spain
[5] Antonio de Nebrija Univ, Madrid 28040, Spain