first class you pay more then Air fare. They serve food round the clock. They give you proper sheets and blankets.
You have more freedom. one said you will have a ball.
2nd class is 1/3 less then air fare. But has little amenities.
3 rd classs is affordable I will not recoment Travelling 3rd class you will get lesser amenities i have not traveled.
but I heard First class AC travel is very good.
Don't worry about go for ot have a ball. you will need advance reservations. Seat get filled. to see India take first class or second class. Don't go below that. Forniger travel under foreign Quota you have to show USA or Foreign Passport.
Without Passport they will not make reservations for you.
to cancel the reservations you have to give them 72 hours.
But you will get back money in Rupees only. They accept Foreign Currency. check with them the cancellation policy.
i would bring my water food with me in case you have problem. but most likely you will have fun. it was noisy in a Passenger class when i Traveled for 17 hours. You really want first class travel. You will say yes i am happy for the money i paid. major cities where you can buy tickets with US dollars/ or foreign currency. i want to see india.
First class travel is still cheaper or equal to air fare.
Jet airways domestic travel is not cheap but if you shop around bargains are available.
I will check both train and air fare to keep both option available. By air you can make it by 2 to 3 hours by train long distance can take 12 to 16 hours on Rajdhani and Shatabdi.
delhi Bombay is quite a ride.
Air deccan go air spice jet accepts 20 kg checked in baggage fare is very cheap Delhi to Bombay $65 , 8 kg carry on allowed. i think advance reservations i will say upto 1 week in advance you can get cheaper fare.
go to www.yatra.com there you can check theprices.
if you can afford travel First class. lots of food is available round the clock. Properly Air Conditioned limited people. your paspport is verified when tickets being issued.
I will recomend bring along ear plugs in case it should be very well maintained. i will bring all my medications if you have any illness. if I am traveling abroad i will be fully equiped. I heard First class is really good and comfortable little expansive but worth it you can see India.