Abstract
Recent years have witnessed a growing demand for improvements in a-c multiple-unit car equipments. This paper, together with three companion papers, <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1,2,3</sup> deals with principal objectives of the improvement program and shows how they were attained in new equipments now going into revenue service on a large eastern railroad. The principal improvements center in the use of four newly designed traction motors per car, instead of the usual two, and a resistance acceleration scheme containing a new motor-driven cam controller. Improvements also were made in protective schemes and in arrangement of apparatus. Dynamic braking, now being worked out as a next logical development step for a-c cars, also is discussed briefly.
Published Version
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