ANNOTATION This book is an attempt to reach a new, more general and holistic level of understanding the development and evolution of the world's trolleybus systems. Based on a systematized review of trolleybus systems' data, the book presents the development history and technical specifities of the popular urban means of transportation powered by electricity and known as trolleybus. This is the first publication of its kind that presents a structured body of information on all of the world's trolleybus systems - both extinct and extant - broken down by country. Descriptive and comprehensive data are provided for each trolleybus system, including such information as the total length of the service lines and the number of vehicles in the fleet in different historical periods of its existence. The book is richly illustrated with archive and modern photographs. It is designated for specialists, as well as a wide reading audience interested in urban transport.