Indian Railway Classes: AC (1A,2A,3A), Sleeper (SL ...
These are Second Seating Class by the Indian Railways. 2S is a Non AC class coach which are the cheapest class to travel by the Indian Railways. This class is common in most daytime Intercity and Janshatabdi trains. 2S can be reserved or unreserved. For reserved 2S category coaches are equipped with chair car seats in 3X3 fashion.