This book is designed to meet the objectives of the Synthesis and Analysis of Gear Trains. Subject content is presented in a simple and lucid manner. Attempts are made to serve this purpose by adopting step-by-step procedures to analyse the Epicyclic Gear Trains (EGTs). Wide varieties of methods are explained in detailed about Velocity ratios of EGTs, which is very usefull for the scholars in this field of interest. Symmetry and Isomorphism is identified at various level of arrangements of gear Trains.