Tirumala cannot have RSA with Mahbubnagar express due to turnaround lesser time for PM/SM which requires 8 hrs including shunting into yard and PF and lates if any. MBNR arrives at 700 and has to leave by 1400 again Tirumala arrives at 1130 while MBNR leaves at 1830. Earlier Korba used to leave at 2000 was delayed to 2100 with speedup of hour in both sides to accomodate PM/SM schedules. Korba express with this configuration ran full during summer holidays and same will be during weekends. As this is full off season there won't be much demand for AC classes. First AC is totally not required as it gives 50-70% of revenue potential even when its full. Sleeper has good demand then 3AC too but they are also being reduced.