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MTH Premier 20-21736-1 O Scale GE AC4400 Diesel Union Pacific UP 6300 PS3 Theme_Star Trek Rail dock inserts let youMTH Premier 20 21736 1 O Scale GE AC4400 Diesel Union Pacific UP 6300 PS3 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. The superior