The purpose of this book is to bring together brief descriptions of more than four hundred unique transport systems. The book contains information on narrow-gauge railways and trams, as well as ropeways, overhead railways, and monorails, and several park railways located on the territory of modern Ukraine and Moldova. Also included are military narrow-gauge railways in Romania, built by the Russian army during the First World War. Due to the fact that material for this book was collected using the "crowdsourcing" method through the now-defunct "Younger Brother" website, the book in no way pretends to be complete, accurate, relevant, and scientific. Some data could be outdated, some may be inaccurate. Nevertheless, since this is the first experience of publishing a manuscript of this kind, I consider all the above disadvantages acceptable - provided that the book is not used by the readers to make vital decisions.