Bangalore TOI, Mar 6, page 2:
"... Planners have, therefore, suggested making use of the existing railway corridor ... the proposed train between Chikballapur and Bangalore city will be taken up as a priority. Two trains run between the city and Chikkaballapur and these trains can be utilized if there is a demand,’’ divisional manager of Southwestern Railway, Mahesh Mangal, told TOI."
Good to see someone wake up to this possibility that Vasanth/others have suggested here a few times already. This would be the track in question: