All you need to do is show the ticket examiner the ‘mobile reservation voucher’— an SMS containing your reservation information and back it up with a valid photo ID.
“With mobile phones becoming gadgets for business productivity and entertainment besides telephony, railways had to make its services available in this space,” said a railway ministry spokesman.
The website is still weeding out minor kinks involving page loading and user registration, but the railways are surging ahead with the plan for mobile devices. Travel agents and such bulk customers have been barred from using the service, as each ID can book up to eight tickets per month.
While currently the mobile application is compatible with most GSM and CDMA phones, sources said officials are deliberating specific applications for Blackberry and iPhone. Mobile ticketing is just one aspect of the website. Passengers can also book retiring rooms in advance.source