The reason for this is that this car is shorter than the older cars. Thanks to modern design, we have the ability to build a car that is shorter than the older cars and lighter than the older cars. However, as you go through the figures there, you can see that it carries much more and has a shorter envelope, which allows in a normal train an additional nine cars.
You know, we talk about the carbon footprint being lower. Those nine cars basically travel for free once you get a train start.