Question: When driving a horse or team of horses (in this case a single horse & buggy), do you use 'reins' or 'lines'? I have seen both in books, but I don't know if there's some specific difference between them or if they're interchangeable. I've written a story where I use both interchangeably, depending on which sounds better in that specific sentence, but I want to be sure this isn't a mistake.