The trains on the light rail here are "articulated." That is, each individual train-car is "really" two cars, with a flexible section between them that allows them to bend in the middle when making turns. It's a pretty simple-looking arrangement on the outside.
Inside, though, I'm not sure it's that simple. There's a big round section of floor that rotates around the pivot point, maybe 6-8 feet in diameter. There are no seats there, but there are handrails, and if the train is busy, it's not unusual for a few people to congregate there.
It's also interesting (and a little... strange, maybe) watching that section turn with respect to the rest of the car. Not quite a vertigo-inducing thing, at least not for me, but interesting still... It doesn't pivot much, but it's definitely very visible...