Yes, children can ride the train, and in 2026, rail networks are more child-friendly than ever. In the UK, children under 5 travel for free with a paying adult, and those aged 5–15 get a 50% discount. Most European and US rail lines (like Amtrak) allow children aged 13–15 to travel unaccompanied on certain routes, provided they have a signed parental consent form and follow specific daytime-only schedules. For younger children (typically under 12), an adult aged 16 or 18+ must accompany them. In 2026, many high-speed trains (like the ICE in Germany or the TGV in France) feature dedicated "Family Compartments" with play areas. Always carry proof of age (like a passport or birth certificate copy) for your child, as ticket inspectors in 2026 are increasingly diligent about verifying eligibility for age-based discounts.