A Double-Decker Train is a type of passenger train that features two levels of seating. This design allows for more passengers to be accommodated within the same train length, making it an efficient choice for busy routes. The upper and lower decks are connected by stairs, providing easy access for travelers. These trains are commonly used in urban and suburban areas, where high passenger volumes are typical. Many railway companies around the world, including those in Europe and North America, have adopted double-decker trains to enhance capacity and improve the overall travel experience.