The main rush is from SBC-CPT , Many board at Kengeri. if SBC is congested then SWR can plan KGI to MYA Fast DEMU with halts at Bidadi,Ramnagara ,Channapattnam, Maddur, Hanakere finally Mandya at 18:10 hours from Kengeri to CPT. Out of the four platforms , only 2 are mostly busy for Kengeri , worst case its 3. So they can start from KGI , Chamundi can skip Kengeri in retrun direction (SBC to MYS like how trains halt at PER on the one way)