Was returning to mumbai from Shirdi in 12132/Sainagar Shirdi - Dadar Express (Via Manmad) in which I had booked a tatkal ticket in 3AC. Checked the 3A reservation chart to find that my name is not listed. Went to the TTE at the station in panic and got to know that I was upgraded to 2AC. So, my first travel in a 2AC coach was through updradation. :D