I don't think making all lines of karnataka double is necessary. If they run trains on those some single lines then it's enough for better rail service and also karnataka cities need Train maintenance facility as present only Bengaluru, Hubli, Mysore and Arsikere have them which makes trains to often connect these places to get maintenance which is not better thing they need to do such facility at Ballari, Bijapur, Hassan, Gadag, Davangere by which new trains can be started from these places to serve most of the passengers. Majorly important lines getting doubled and electrified but still new line connections needed in state to be completed soon.