Comprehensive Annual Maintenance Contract Of Integrated Passenger Information System ( Ipis Make M / S Dat Informatics Pvt. Ltd. ) Consisting Of Train Information Display Boards ( Tib ) , Coach Guidance Display Board ( Cgdb ) And Coach At A Glance Display Board ( Agdb ) Installed At Patna Sahib ( Pnc ) Station For A Period Of 03 Years Under Danapur Division