Yes, a 15-year-old can travel alone on Amtrak, but they must follow the specific Unaccompanied Minor Policy. Children aged 13, 14, and 15 are permitted to travel solo provided the trip takes place on a single day (no overnight travel) and stays within the United States. The journey must start after 5:30 AM and end by 9:30 PM, and no transfers of any kind are allowed. Additionally, both the departure and arrival stations must be staffed. Reservations for unaccompanied minors cannot be made online or via the app; you must call 1-800-USA-RAIL to book. On the day of travel, an adult must sign a release form at the station and stay until the train departs. The minor will be interviewed by station staff and must wear an Amtrak-issued wristband for the duration of the trip. Full adult fares are charged for these tickets, and children's discounts do not apply.