Use IRCTC for railway booking, tatkal reservation or any booking, you will curse being on earth for the same. It is too deadly slow that even the most speedy connection you can manage cant manage to open it. As soon the page will load, on next click you ll get a message "Session expire". The session barely opened. Customers have no other option as IRCTC have monopoly in Railway bookings.
This is the most Important yet the slowest busiest site.