SE1 is a code for a type of coach in Indian Railways. It stands for "Sleeper Extra Coach 1". It is an extra sleeper class coach that is attached after the S1 coach. Sleeper class coaches are non-AC coaches that have 8 berths in each compartment, including upper, middle, and lower berths, as well as side upper and side lower berths. The ticket fare in sleeper class coaches is generally less than AC three-tier coaches. The exact location of the SE1 coach in a train can vary, but it is likely to be at the front end of the train. The final coach position will be displayed on the platform at the time of departure, and passengers can also contact the station master or any railway staff for further assistance.