What's the difference between first and second class?
First class seating is more spacious with fewer seats per compartment, and usually quieter. There is more room for luggage and generally will be less crowded as most passengers typically travel in second class. First class accommadations may also include laptop connection plugs, complimentary soft drinks, free newspaper of the day, leather seats, and/or meals.
There are benefits on overnight trains as well; first class passengers are usually alloted a single or double sleeper compartment, while others may be required to occupy couchettes with up to 6 persons per compartment.