Company delivered the first cars equipped with roomettes – that is, the car's interior was sectioned off into compartments, much like the coaches that were still in widespread use across Europe. Pullman's roomettes, however, were designed with a single traveller in mind. The roomette featured a large picture window, a privacy door, a single fold-away bed, a sink and a small toilet. The roomette's floor space was barely larger than the space taken up by the bed, but it allowed the traveller to ride in luxury compared to the multilevel semiprivate berths of old. Now that passenger cars were lighter, they were able to carry heavier loads, but the size of the average passenger that rode in them didn't increase to match the cars' new capacities. The average passenger car could not be made any wider or longer due to side clearances along the railroad lines, but they generally could get taller because they were still lower than many freight cars and locomotives. The railroads soon began building and buying dome and bilevel cars to carry more passengers. 1950–present: High-technology advancements Starting in the 1950s, the passenger travel market declined in North America, though there was growth in commuter rail. Private intercity passenger service in the U.S. mostly ended with the creation of Amtrak in 1971. Amtrak took over equipment and stations from most of the railroads in the U.S. with intercity service. The higher clearances in North America enabled a major advancement in passenger car design, bi-level (double-decker) commuter coaches that could hold more passengers. These cars started to become common in the United States in the 1960s, and were adopted by Amtrak for the Superliner design as well as by many other railroads and manufacturers. By 2000, double-deckers rivaled single level cars in use around the world. While intercity passenger rail travel declined in America, ridership continued to increase in other parts of the world. With the increase came an increased use of newer technology on existing and new equipment. The Spanish company Talgo began experimenting in the 1940s with technology that would enable the axles to steer into a curve, allowing the train to move around the curve at a higher speed. The steering axles evolved into mechanisms that would also tilt the passenger car as it entered a curve to counter the centrifugal force experienced by the train, further increasing speeds on existing track. Today, Talgo