With the rapid development of China's society and economy, urban rail plays an increasingly important role in transportation. To ensure the smooth and safe operation of rail vehicles is the responsibility of every scientific research worker engaged in rail industry. Hence, the monograph intends to introduce several aspects for the operation stability of rail vehicle, e.g., its stability, fault diagnosis and fatigue driving detection. This book, further refined at Chongqing Vocational College of Public Transportation in China, has expanded our understanding towards the train stability monitoring and fault diagnosis, also driving safety in terms of driver fatigue detection system.