Manufacturing, supplying & stacking of 50 mm size of machine crushed track ballast of approved quality conforming to latest RDSO Specifications within Railway boundary all along the section and Manufacturing, supplying & loading of 50 mm size of Pakur variety machine crushed stone ballast of approved quality conforming to latest RDSO Specifications from quarry Pakur/ Talijhari/ Bakudi/ Sahibganj/ Pinergaria for the yard section and all other connected ancillary works as per requirement in between stations Katihar ( including ) and Sonaili ( including ) from Ch: Km 0. 00 to Km 17. 30 of Katihar- Mukuria section and Katihar ( excluding ) and Pranpur Road ( including ) from Ch: Km 1. 388 to Km 19. 70 of Katihar- Kumedpur section in connection with Katihar- Mukuria- Kumedpur double line project of N. F. Railway ( Construction ).