The term "AC 2 Tier" refers to a specific class of accommodation available on Indian Railways trains. This class features two levels of sleeping berths, allowing passengers to maximize space and comfort during their journey. Each compartment typically has four berths on each side, with curtains for privacy and amenities like reading lights. Passengers in AC 2 Tier enjoy air conditioning, which provides a comfortable environment, especially during hot weather. The class is popular among travelers seeking a balance between affordability and comfort, making it a preferred choice for long-distance train journeys across India.