The period of twenty — three years and a half that elapsed since the first edition of Locomotive Engine Running and Management was published has seen the. Introduction of many additions to the appliances used in operating the locomotive, but the engine itself has been changed very little, except being made larger. Progress in locomotive engineering is largely repte sented by improvements upon the appliances referred to, and to the introduction of new ones. In preparing the twenty-second edition of Locomotive Engine Run ning and Management it has been my aim to make the book a certain and safe manual of instruction to the modern locomotive engineer. The best practice in hand ling locomotives has been made as plain as possible and the principles of locomotive engineering, which embraces information concerning heat, steam, and motive power, have been explained in words that will be understood by every person who can read.