It is acknowledged that unsustainable transport comes with a price. Poor environment and health of the citizens could be contributed to the failure of ciitie sin developing countries to maintain a strong public transport system. Often, the public transport or mass transport systems are neglected or perceived as low class option. This is evident from the appalingly low quality of transit systems operating in many Indian Cities. The National Urban Transport Policy advocates robust mass transit systems for the cities to solve the problems of poor mobility and detoriatorating environment. This module on Public Transport covers various aspects of mass transit systems that are useful to decision makers and operators alike in achieveiing sustainability in public transport