You can check train fares at www.indianrail.gov.in. However, here are some sample one-way fares in rupees, including reservation and fast train charges. This will give you an idea of how much Indian train travel costs, and how the fares for different classes compare.
Children aged 0 to 4 travel free, children aged 5 to 11 travel at half fare, children aged 12 and over pay full fare.
Shatabdi Express = Premier daytime train, special fare payable, meals included.
Rajdhani Express = Premier overnight train, special fare payable, meals included.