In 2026, the rules for a 14-year-old traveling alone on a train vary by country and rail operator, but it is generally permitted with some restrictions. In the United States (Amtrak), 14-year-olds can travel unaccompanied but are considered "Unaccompanied Minors" and must follow a strict policy: they can only travel on certain trains, cannot cross the US-Canadian border, and a parent must sign a release form at the station. In the UK (National Rail), most operators allow children aged 12 and over to travel alone, provided they are confident and have a way to contact their parents. For the Eurostar (traveling between London and Europe), 12-to-15-year-olds can travel alone if they have a signed Eurostar "unaccompanied minor" form, though they must travel during daylight hours and be met at the destination. In most of Europe (SNCF, DB), 14 is considered old enough to travel without special assistance, though parents are always advised to ensure the child has a fully charged phone, an identification document, and a clear understanding of their route and any planned transfers.