You can book railway tickets online using irctc.co.in. To you this you may need railway station codes. You can get it from that website itself, but that is a little slow. So you can find a list of railway stations and railway station codes in the following website

• Station Codes - A to F
• Station Codes - G to L
• Station Codes - S to Z

• Station Names to Codes - A to F
• Station Names to Codes - G to L
• Station Names to Codes - M to R
• Station Names to Codes - S to Z

Some other Useful Sites

• http://www.southernrailway.org/
• http://www.nr.indianrail.gov.in/
• http://www.sr.indianrail.gov.in/
• http://www.indianrail.gov.in/

and here is a list

http://www.indianrail.gov.in/other_rly_sites.html