Indian Railways carries over 2 crore passengers per day and IRCTC is the e-ticketing arm of the Indian Railways. The Tatkal scheme, which was first introduced in 1997, is used for booking tickets at a very short notice. Under the non-Tatkal or general ticket booking scheme advance reservations can be made up to 120 days in advance. Tickets can be booked online through IRCTC website or computerised passenger reservation centers of the Railways. Booking for Tatkal tickets of AC classes opens at 10:00 am and for non-AC classes at 11:00 am, one day in advance of the actual date of journey. Bulk of the tickets under the Tatkal scheme gets booked within minutes of the opening of the booking.