
Indian Railways runs festival special trains during Diwali, Chhath, Holi and Durga Puja when regular trains have long waiting lists. The fares on these special trains are 10 to 30 per cent higher than regular trains because of a special fare structure.

Regular trains get priority on routes and generally run on time. Festival special trains are often held up to give way to regular trains, making them more likely to be delayed. The railways operates these special trains under special arrangements.
The fare difference of 10 to 30 per cent means a family travelling on a festival special could pay several hundred rupees more per ticket. Passengers must weigh the certainty of a confirmed seat against the higher cost and greater risk of delay. The railways does not specify how much delay a passenger should expect, leaving travellers to decide on their own.
Source: amarujala.com
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