IRCTC's online rail reservation
The IRCTC - Indian Railway Catering & Tourism Corporation, now provides the facility for transacting with Indian Railway's PRS System through the Internet

SOME BASIC INFORMATION IS LISTED HERE  - HOWEVER THE PASSENGER INTENDING TO UTILISE THESE SERVICES MUST RECONFIRM ALL FACTS ONLY AT THE IRCTC WEBSITE

BOOKING - ONLINE THROUGHT THE INTERNET
Advance booking in any class, against general and ladies quota, on payment of fare in full for adults and children, a maximum of six berths/seats at a time, for journey between any two stations served by a train subject to distance restrictions in force. Also includes booking on payment of concessional fare for senior citizens. Any other bookings like concessions, season tickets, cluster (offline) stations, break journey or prebought tickets, reservation on free pass, INDRAIL passes and 360 days advance reservation for foreign tourists, TATKAL tickets CANNNOT BE DONE HERE   

DELIVERY THROUGH COURIER OR COLLECTION AT DESIGNATED COLLECTION CENTRE
Courier delivery of booked tickets (for the present, delivery of tickets through courier is limited to postal addresses within within Bangalore, Chennai, Kolkata and Mumbai (which includes municipal limits of Thane, Kalyan and parts of Navi Mumbai) and Delhi National Capital Region which includes parts of New Delhi, Ghaziabad, Faridabad, Noida and Gurgaon) or Collection of tickets by customers from designated collection centre (Only in New Delhi)

TERMS & CONDITIONS FOR USE OF TICKET, CANCELLATION & REFUND
1. Register as an individual on the IRCTC site (This involves acceptance of stated terms & conditions). Registration is FREE.
2. Login as a member, entering user name and password. For security purposes, the Password entered is transmitted in one-way encrypted form to the database and stored as such. Thus the Password will not be known even to IRCTC.
3. The "Plan my travel and Book tickets" page appears. Read the page "TICKET BOOKING ON THIS SITE - A GUIDE", for detailed step by step directions for filling up the form, and refer to help if and wherever necessary.
4. Note that booking through Internet is allowed from 8 AM to 8 PM (Indian Standard Time) on weekdays and from 8 AM to 2 PM on Sundays. You may make a reservation for individual travel or group travel up to a maximum of six people including children in one booking requisition.  A registered user cannot book more than four (4) tickets in one calendar month.
5. All payments towards the cost of the tickets issued will be by any one valid credit card(s) listed in the payment options given in the reservation page, with sufficient balance to cover the cost of the ticket and service charges. At present, Master and Visa cards only are accepted. The site is VeriSign secured and the credit card details will travel on the Internet in a fully encrypted (128 bit, browser independent encryption) form. To ensure security, card details are NOT stored in the Website.
6. As per present rules, booking is accepted up to 60 days in advance of the date of journey (journey date not to be included) from train originating station at all PRS counters. Please note that in case of some inter city day trains, the ARP (advance reservation period) is less than 60 days, booking must be done accordingly. For tickets that are to be delivered by courier to the customer, there must be two clear calendar days between the booking date and the date of travel.
7. The booking and reservation will be confirmed online, after the transaction is successfully completed. Further, the system will issue a unique Transaction ID for each booking. Payment on credit card is enabled electronically via the ICICI Bank’s Electronic Payment Gateway.
8. After booking the tickets through this site, the details of berth/seat number, RAC/Waitlist position at the time of booking , PNR No and a Unique Transaction ID will appear on the screen. This Transaction ID and all other details must be preserved for future reference.

CHARGES
You are required to pay the cost of the ticket and the service charge as indicated in the reservation page with any of the credit cards listed in the page, by keying in the credit card details in the place provided. 
Service charge at Rs. 30/- per ticket for Sleeper Class/Second class and Rs 50/- per ticket for higher classes will be levied which is not refundable. 
Fee for credit card transactions at 1.8% (the rate is subject to change) of transaction value (Total Fare + Service Charge) is payable to the bank separately. 
Difference of fare if any due later, consequent to revision in tariffs etc, have to be paid at the station before the commencement of the journey.

CANCELLATIONS & REFUNDS
No cancellations will be provided on the Internet. To cancel a ticket, the customer will have to submit the ticket at a PRS counter. The fare paid by the customer will be refunded electronically (as credit to the relevant credit card used for the transaction) after deducting cancellation charges. The cancellation charge is determined by the Indian Railway’s rules for cancellation and is based on the time of cancellation and the status of the ticket. PRS counter will issue a cancellation ticket/receipt and IRCTC will credit the amount of refund due, to the customer’s credit card account. No cash refund will be given to the passenger. 

KR Online Reservation System - Internet Booking : Click here to read details
This facility has been started in India for the first time, specifically for assisting those who are returning/ travelling from abroad and wish to travel by Konkan Railway.

Special Terms And Conditions For Internet Booking Of Tickets (From the KR Website)
FOR: Indians, Foreign Nationals and NRIs holding a valid passport. 
TRAINS:  0111 Dn, 0112 Up Konkankanya Express between Mumbai CST to Madgaon (Goa) or vice versa. 
ACCOMMODATION:  3 Tier Air-Conditioned Class. 
PER PASSENGER CHARGES: Indian Rupees 1250.00 - ONE WAY JOURNEY 
ADVANCE BOOKING PERIOD: Seven days in advance up to two days before the journey date (excluding the day of journey). 
MAXMIUM PASSENGERS PER TICKET: Four. 

CONFIRMATION & COLLECTION OF TICKET : Confirmation of ticket along with PNR number will be e-mailed to the passenger. The copy of this e-mail should be produced at the time of boarding the train. 
Passenger can collect the tickets from on duty Passenger Assistants of Konkan Railway at the time of boarding the train at Madgaon or Mumbai by furnishing a copy of passport as proof of identity. Passport has to be shown to the Passenger Assistant. 

TERMS & CONDITIONS FOR USE OF TICKET, CANCELLATION & REFUND: 
Tickets once confirmed by Konkan Railway will not be admissible for refund in case of cancellation. 
Passengers can get down at any place en-route; however, ticket will be treated as fully used. 
In case of any reason, passenger fails to perform journey at the starting station, he is not entitled for any refund. 
No postponement of the journey date is permissible.  

The Passenger must then fill up the ONLINE TRAIN RESERVATION FORM and on submitting this information to the database for processing, is diverted to PAYSEAL, a SECURE PAYMENT GATEWAY set up by one of India's Leading Financial Institutions, ICICI . 

Payments are made using Mastercard or Visa Credit Cards. The security technology employed is SSL (Secure Socket Layers) using 128-bit encryption. 
Read about this security technology here.