The "Pennsylvania Trolleys in Color, Vol. 4 Hardcover Book By LeRoy O. King" is a textbook and guide written in English by LeRoy O. King. It focuses on the history and details of Pennsylvania trolleys, specifically in color format. This hardcover book is divided into volumes and offers a comprehensive look at the topic, making it a valuable resource for model railroaders and train enthusiasts looking to learn more about the Pennsylvania trolley system.
