Multiple choice general knowledge What is the Abbreviation used for 2-Tier AC ? 2AC 2A 2TAC 2C Reveal answer Fill a bubble to check yourself B Correct answer Explanation 2-Tier AC (Second AC) is abbreviated as '2A' in Indian Railways. The naming convention for AC classes is consistent: the tier number followed by 'A'. This class offers more privacy than 3A with 2 berths on each side of the aisle.