Excerpt from Cyclopedia of Applied Electricity, Vol. 5 of 7: A General Reference Work on Direct-Current Generators and Motors, Storage Batteries, Electrochemistry, Welding, Electric Wiring, Meters, Electric Lighting, Electric Railways, Power Stations, Switchboards, Power Transmission, Alternating-Current Machinery Before a student can appreciate the purposes of the different parts of an electric railway system, he must know what the primary purpose of such a system is, as the details of selection and operation Of equipment must have a direct bearing upon this purpose. Let us start, therefore, with the following important statement, which we shall try to keep in mind throughout the course. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.