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While following the occupation of a locomotive engineer, I often observed peculiarities about the working of my engine, while running, that I did not entirely understand. As I was perfectly aware, even before making my first trip on a locomotive engine, that there is no effect without a cause, I never felt satisfied to accept any thing as incomprehensible without investigation, and fell into the habit of noting down facts about the working of the engine, with the view of studying out, at leisure, any thing which was not quite clear. When, some years ago, I abandoned engine-running to take charge of the round-house at the mechanical headquarters of the Burlington, Cedar Rapids, and Northern Railway, in Iowa, the practice of keeping notes was continued. The work connected with the ordinary repairing of running-engines, the emergency repairing executed to get engines ready hurriedly to meet the traffic demands on a road then chronically short of power, and diagnosing the numerous diseases that locomotives are heir to, provided ample material for voluminous notes. Those notes formed the raw material from which this book was constructed.

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.

The practice of applying to books for information concerning their work, is rapidly spreading among the engineers and mechanics of this school-spangled country; and this book is published in the hope that its pages may furnish a share of the needed assistance. Those men, who, Socrates-like, search for knowledge from the recorded experience of others, are the men, who, in the near future, will take leading places in our march of national progress. To such men, who are earnestly toiling up the steep grade of Self-help, this book is respectfully dedicated.

Angus Sinclair.

New York City,

Jan. 1, 1885.