> It's a train, because there's exploration to be done around what happens on a journey that is both linear and fixed. Eh, they could have done that with a she

> It's a train, because there's exploration to be done around what happens on a journey that is both linear and fixed. Eh, they could have done that with a shelter built in a tunnel or something like that. But that would have been boring; it's a train because trains are cool. And they could have had the train circling a city or even continent, but they made it circumnavigate the world instead because that's cooler.