what is su in train

In the context of train travel, "SU" stands for "Side Upper Berth." It refers to a specific type of sleeping berth in Indian Railways, which is located on the side of the train compartment and positioned in the upper section of the sleeping arrangement. This information is commonly found on railway tickets and seat layout diagrams. The "SU" designation is important for passengers to understand their assigned sleeping accommodations while traveling on Indian trains.