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A passenger car is a railroad car specifically designed to transport people. Early passenger cars were essentially modified road coaches with added flanged wheels. Over time, designs evolved, with North American railroads favoring longer, eight-wheeled cars on two four-wheel trucks (bogies) for a smoother ride.12

Modern passenger cars vary in length depending on the region and service type, with lengths typically ranging from 19.5 to 26 meters (64 to 86 feet). Construction materials have shifted from wood to steel, with increasing use of aluminum to reduce weight and energy consumption, especially for high-speed trains. Features like flexible gangways, allowing access between cars, led to specialized types such as dining cars and lounge cars. Sleeping cars, designed for overnight travel, were a significant development, with the Pullman sleeper becoming commercially available in 1865.234

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