sentences:  The firsts tests occurred on the Foggia-Benevento line in the September 1927, using three prototypes built by Savigliano, with the electrical equipment provided by Metropolitan-Vickers of Manchester.The first 14 prototypes (eight E.625 with lower gear ratio, for freight services, and six E.626) proved powerful and reliable, and entered service the following year.The only teething problem encountered was with the six 32R motors mounted on the axles, hanging laterally over transverse beams, a system devised to avoid the complicated side rods of the contemporary steam and three-phase locomotives.