 
Indian Railway Catering and Tourism Corporation (IRCTC) provides an online booking facility through its web site. Customers can book tickets online with a credit card, debit card or a net banking account.
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How to Book Railway Ticket Online
First step in booking a ticket online is to create a new account in IRCTC site.
IRCTC Online Ticket Booking Site
     
     Go to the new user signup page and fill your personal details to create a        new account. Also there is option to select extra features like Mumbai        suburban season ticket booking, mobile railway ticket booking, preferred        payment option for sms based booking, registration options for SBI Railway        Credit Card and Subh Yatra and signup options for special offers, news        letters and commercial offers.
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