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Indian Railways specifies the minim amount passengers will be fined for travelling without a ticket. To date (April 2017) that an excess fee (i.e. a fine) starting at 250Rs, to be added to the full ticket amount from departure (or equivalent location) to destination. Since I am having trouble loading the official Indian Railway websites, I will quote from an unofficial website ran by an enthusiast (which themselves quote from Page 281 of Southern Zone Time Table valid from July 2012):
RULES REGARDING PENALTIES IMPOSED FOR VARIOUS IRREGULARITIES
1) Travelling without proper pass or ticket Fare from the station which he has travelled or from the station which the train originally started or from the checking point with equal amount of excess charge subject to a minimum of Rs. 250/- upto the point of detection.
This article from the Times of India states the same:
Forgetting to buy a platform ticket of Rs 10 will make you pay at least Rs 250 as fine.
The reason why the rules specify only the minimum fine is IMHO because Indian Railways can specify different amounts depending on factors such as the fare and the journey. The linked article talks about a specific train line (Northern Railway departing from Lucknow) on which so many travellers were caught without ticket to warrant the introduction of more severe fines.