Multiple-unit car equipment for a-c electrified railways

This description of the latest a-c multiple-unit car equipment to go into service on the Pennsylvania Railroad reviews the features which have been incorporated to provide motors and control at a reasonable cost, with adequate margin for the service, and which are expected to result in major economies in operation over the years. The possibility of reducing costs of multiple-unit cars by the use of Ignitron-rectifier motive power to effect standardization of traction also is discussed in this article.