Local rail where it is not popular now can not made popular due certain factors:
Major is railway belongs to IR
IR can not suffer it's existing choked lines due to new Local trains Just see how many trains went MYS/BNC due to capacity problem at YPR/SBC
State have very negligible say in train operations
Yes...
more... city like HYD/MAS/Calcutta have strong local train system but BLR in spite of huge growth is unsuitable for local train system.
I still wonder who planned Metro termination at BYPL a place no where ignoring KR Puram and beyond the most needy places.