Control for 3,000-volt multiple unit cars

Because of the relatively high voltage used and the necessity of mounting the apparatus in a limited space, many new problems of control design were encountered in the 3,000-volt d-c. suburban electrification of the Lackawanna Railroad. This article describes the construction and operation of some of the more important of the control apparatus developed, and the tests made to assure its suitability to the service for which it was designed.