Here are some of his notable works:
* "The Iron Road to the Sea" (1978): This book focuses on the development of the Baltimore & Ohio Railroad and its impact on the American economy.
* "Public Utility Regulation: The Railroad and the Electric Utilities" (1990): This book explores the history of public utility regulation in the United States.
* "The Ironmaker: The Life of David Thomas" (2003): This biography tells the story of David Thomas, a pioneer in the American iron industry.
* "The American Railroad: A History of American Railroads" (2008): This book offers a comprehensive history of American railroads, covering their development, impact, and decline.
Traynor has also contributed articles to numerous academic journals and edited several books on transportation history.
His works are considered authoritative and insightful, providing valuable historical perspectives on the development of key technologies and industries.