It's a bit more complicated than that. These train cars will be going somewhat faster, and accelerating and decelerating a lot more than a typical long distance

It's a bit more complicated than that. These train cars will be going somewhat faster, and accelerating and decelerating a lot more than a typical long distance highway journey. Of course I'm sure they'll employ regenerative breaking, but even so, it's a lot of energy to load and unload from the battery over and over again.