"They are quite useful, I've heard. Publicly available transport for long distances, some of them, if one does not have a car or the money to ride in a plane. Most, though, are used for transportation of goods, coal, livestock, lumber, metal, cars, food... to get them where they need to go, hundreds and hundreds of miles away in only a few days."

It's one of humanity's more sensible ideas, he thinks.

It takes about three minutes for it to pass fully. They watch until then.