If you have booked Railway ticket online, now you don’t have to take the printout to travel. In a new initative by the railways, you can show the ticket in your mobile, laptop or ipad. Here are the details about it from irctc website.
Electronic Reservation Slip (ERS) – The printout in standard specified Performa containing reservation particulars, and instructions for use which can be used by the passenger along with the relevant authorizedIdentification, as travel authority for performing the journey.
Virtual Reservation Message (VRM) – A screen-shot of the e-ticket displayed through laptops/palmtops/ Mobile phone is referred as Virtual Reservation Message (VRM).
ERS/VRM along with any one of the eight prescribed ID proofs in original and the indication of the passenger(s)’ name(s) in the Reservation Chart will authorize the passenger to travel.
VRM combined with valid photo-id in original will be treated as an instrument on par with the ERS.
ERS/VRM along with one of the eight prescribed proofs of identity in original will also authorize the passenger to enter the platform on the day of journey and he/she will not be required to purchase platform ticket. ERS/VRM along with original id proof will be required to be produced on demand of Ticket Checking Staff on the platform.