Okay, so you know how a train is a big long thing with lots of cars attached to it? Well, a bilevel rail car is just one of those cars, but it's kind of special because it has two levels inside instead of just one.
On the bottom level of the bilevel rail car, there are seats for people to sit in. It's kind of like a regular train car, but there's more space for seats because the car is taller. The seats might be a little different than what you're used to because they have to fit into the smaller space.
But what's really cool about the bilevel rail car is the top level. Up there, there's an extra set of seats too! To get up to the top level, there's usually a staircase or an escalator. Once you're up there, you get a really good view of everything outside because you're higher up.
And that's pretty much it! The bilevel rail car is just like any other train car, but it has two levels inside. It's a bit like having a double-decker bus or a big house with stairs.