Wood, William Wallace The Walschaert Locomotive Valve Gear: A Practical Treatise On the Locomitive Valve Actuating Mechanism Originally Invented by Egide Walschaerts, With ... Designers, and Its Evolution Into the Mech

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The Walschaert Locomotive Valve Gear: A Practical Treatise On the Locomitive Valve Actuating Mechanism Originally Invented by Egide Walschaerts, With ... Designers, and Its Evolution Into the Mech