Base means u mean ballast spreading for laying line? I don't think Almatti sitimani kadlimatti takes place as still one bridge parvati katti has to be constructed.. From gadag end at outer some bridge widening taking place. And their is no any major bridge between Gadag to Holealur and also Holealur bridge pillars ready I think only precast or iron girder need to be placed.. Holealur to Bagalkot section also easy as no major bridge except one at guledgudd entrance from badami side.. Major bridges lie between Bagalkot Wandal section as lot of water logging takes places in rainy season..