Fifteen years´ progress in the design of industrial diesel-electric switchers

The advent of a practical line of diesel-electric industrial switching locomotives waited upon the development of high-speed automotive-type diesel engines and suitable electric transmission and control equipment. When these were made available some 15 years ago, the forerunner of the present industrial switching locomotive was designed. The intervening years have witnessed steady progress in expansion, standardization, and refinement of this line of locomotives. Today it embraces units of varying size and power adequate to meet practically every type of industrial switching duty.