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A Level 1 Data Flow Diagram (DFD) for a railway reservation system illustrates the main processes involved in booking a ticket. It typically includes key components such as the user (passenger), the ticket reservation system, and the database for storing train schedules and user information. The diagram shows data flows between the user and the system, such as inputting travel details, receiving ticket availability, and confirming bookings. Key processes might include searching for trains, selecting seats, and processing payments, highlighting the interactions and data exchanges within the system.

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