Indian Railways is focusing on increasing the number of AC passengers. Generally, in a 22-coach train, 12 coaches are allocated for general and sleeper class (non-AC), and eight coaches are AC coaches ...

If the seat number contains 'S', it means it's a sleeper coach. Similarly, if the ticket says B1 or B2, it means your ticket is in the Third AC coach. The M code represents the 3-tier economy AC ...