12628-Karnatka Express-New Delhi to Bangalore
My Journey of A.C-II class was never so bad.I had an upper seat so at the time of sleeping I put my towel on opening of A.C duct (just beside my seat) .When i woke up in morning I found my white towel(hanging on opening of A.C duct) was turned black ,It is thanks to Poor maintenance of A.C in our Railways.
So, All my friends who thinks A.C coaches are better ,you have never experimented .
If you have even an iota of doubt; try it yourself.