A computer reservation system or central reservation system (CRS) is a computerized system that is used for storing and retrieving information and conduct transactions related to activities like booking rail tickets, air tickets, hotels, etc.
There are two possible ways for computerized booking and reservation of rail tickets.
1. By Website booking - There are many websites like IRCTC, MakeMyTrip, etc., which offer online booking and reservation of railway tickets. The person will have to create a login id with appropriate details and can book the tickets online.
2. Through Agents - There are many travel agents available who will be able to reserve online railway tickets through their portals. Upon giving the required information to the agent, they can help in reserving the appropriate rail ticket.