Supply, Installation, Testing & Commissioning Of New Electronic Interlocking System Along With Indoor And Outdoor Gears For Signalling And Telecommunication Arrangement At Marshalling Yard (in-plant Yard) Of Yadadri Thermal Power Station At Veerapalem Village Of Damaracherla Mandal, Nalgonda District With Signalling Modification At Vishnupuram Station Of South Central Railway With Regard To Vnup-y-loop.