It is generally not recommended to use hair straighteners or any other heat styling tools inside a metro train or any other form of public transport. There are several reasons for this: 1. Safety: Hair straighteners generate heat, and using them in a confined space with limited ventilation can pose a fire hazard.

Whether you can use hair straighteners on a train in 2026 depends entirely on the onboard power infrastructure. On high-speed long-distance trains (like Amtrak’s Acela, the Eurostar, or Japan’s Shinkansen), most seats are equipped with standard 110V or 230V power outlets that can easily handle the 150–300 watts required by a hair straightener. However, on older regional or commuter trains, power outlets may be absent or restricted to "low-power" devices like phones and laptops. Using a high-heat device on a weak circuit can trip the carriage's breaker, causing a loss of power for everyone. In 2026, many modern travelers prefer cordless, battery-powered straighteners for travel, as they bypass the need for a plug entirely. If you must use a corded one, it is best to do so in the train's lavatory (which often has a dedicated shaver/appliance outlet) or confirm with the conductor that the seat-side power is rated for small appliances.