double-deck car

A double-deck car, also known as a two-decker car, is a railroad vehicle designed with two levels or decks. This design is primarily used to maximize seating capacity, especially in short-haul commuter services, but can also be found in long-haul intercity operations.

While North American operators sometimes favor a design with an upper gallery, most double-deck cars have a fully separated upper level. For example, a four-car, double-deck electric multiple-unit in Paris can seat 534 passengers. Modern designs, like the French TGV "Duplex" train-sets, feature double-decked cars that are lightweight and provide numerous seats, such as up to 96 seats in a roughly 20-meter-long car.12