PRS (passenger Reservation system) was maintaining by cris for Railways .Reserved travel by Indian Railways is facilitated by the Passenger Reservation System (PRS). PRS provides reservation services to nearly 1.5 to 2.2 million passengers a day on over 2500 trains running throughout the country. The PRS Application CONCERT (Country-wide Network of Computerized Enhanced Reservation and Ticketing) is the world’s largest online reservation application, developed and maintained by CRIS. The system currently operates from 5 Data centers. The server clusters are connected together by a core network that enables universal terminals across country, through which the travelling public can reserve a berth on any train, between any pair of station for any date and class.