sentences:  During 1974 two locomotives (units 056 and 057) were provided with a "shunt chopper" system (later the modifications applied were rolled back, making the two units identical to standard once again), while in 1975 the E.444.005 adopted a "full chopper" electronic system, which was later also adopted on the E.632/633 classes, and which granted a peak power.Curiously, the fact that the E.444s were often used on old lines and coupled to not advanced coaches, usually hampered their performances.For example, only with the adoption of second-generation coaches, like the Grand Comfort type, trains driven by E.444 could replace the old ETR 300 in the Milan-Rome fast service.