OK. The limit might be 20 CC but 18047/18048 AMARAVATHI EXP runs with 22 coaches ( 18 + 4 coaches of KCG VSG SLIP). The trains 17021/17022 & 17419/17420 could be run 12 & 10 coaches making it 22 coaches. Firstly the train is to be speeded up in the both up & down services & made a tri - weekly. Then it will become popular in the long run say 5-6 months & will run with good occupancy ratio.