Indian trains often get fully-booked weeks in advance, so it's worth ticket booking before you get to India if you have limited time or need to be on a particular train soon after your arrival. 

One has two options: Either book Indian train tickets online at IRCTC, which some people find really easy and others impossible. Or you can arrange all your trains, or even just one train journey, through the UK's IndRail pass agency, which is a bit more expensive but completely hassle-free or book your travel train tours india from Makemytrip.com. Tours in India.