We have carts where I'm from, but they move about as fast as the person pulling it. [Machine-powered carts sound like something the world could make a lot of use of - if her tribe ever stopped being afraid of technology for long enough to see.]

Actually, we have something a little like horses, too, but they're machines. You can override them if you have a special device, but usually they attack on sight. I think I was the first one to ever ride one.

[She laughs as something occurs to her.] Sounds like the opposite of your world. We have machine horses and you have machine carts.