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The original intention was, to publish a book on Locomotive Engine Running alone, and the first portion of the work was prepared with that idea in view; but, before the articles were finished, I joined the editorial staff of the American Machinist. The correspondence in the office of that paper convinced me that an urgent demand existed, among engineers, machinists, and others, for plainly given information relating to numerous operations connected with the repairing and maintenance of locomotives. To meet this demand, the chapters on “Valve-Motion” and all the succeeding part of the book were written. Most of that matter was originally written for the pages of the American Machinist, but was afterwards re-arranged for the book.

In preparing a book for the use of engineers, firemen, machinists, and others interested in locomotive matters, it has been my aim to treat all subjects discussed in such a way that any reader would easily understand every sentence written. No attempt is made to convey instruction in any thing beyond elementary problems in mechanical engineering, and all problems brought forward are treated in the simplest manner possible.