Since most of the outstation trains tend to get crowded if you don't book your tickets in advance, you'll have to stand for the entire duration of the train ride. The tickets fall under 3 tiers; 1st class, 2nd class and 3rd class. 1st class tickets have comfortable seats and plenty of leg room while 2nd is slightly less comfortable but busier. 3rd class, the cheapest tickets available is a good option if you're travelling on a budget and don't mind sweating it out a little bit. If you were unable to book tickets in advance you can still buy 2nd class and 3rd class tickets half an hour before the train leaves.