Structural Dynamics of Rail Joints" is a comprehensive book written by Swagat Kumar that explores the critical aspect of railway track infrastructure - the rail joints. Rail joints play a vital role in maintaining the integrity of railway tracks and ensuring the safe and efficient operation of trains. The book delves into the electromechanical impedance principle, a cutting-edge technique for detecting and analyzing the structural dynamics of rail joints. Kumar explains how this technique can be used to identify defects, assess the health of the rail joints, and monitor their performance over time. The book covers a range of topics, including the theory and fundamentals of structural dynamics, the principles of electromechanical impedance, and the design and implementation of monitoring systems for rail joints. The author also discusses case studies and practical applications of the electromechanical impedance technique in the field. The book is an essential reference for researchers, engineers, and practitioners involved in railway track maintenance and management. It provides a thorough understanding of the structural dynamics of rail joints and offers practical insights into the use of the electromechanical impedance technique for ensuring the safe and efficient operation of railways. With its clear and concise writing style, this book is a must-read for anyone interested in the fascinating world of railway engineering.