Model Number: 30-76381

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MTH 20-20636-1 Norfolk Southern AC4400cw Diesel Engine w/Proto-Sound 3.0 #4001 ProductID_11381777 Model Number: 30-76381This is an MTH 20 20636 1 O Norfolk Southern AC4400cw Diesel Engine w Proto Sound 3. 0 #4001. From the dawn of dieselization through its first six decades, virtually every American diesel locomotive used DC traction motors. By the early 1990s, however, a series of technological advances allowed designers to tap the inherent superiority of AC traction namely, the ability of an AC motor to start a heavier load than a DC motor, with the same prime mover.