I don't think the idea was trains at all. I think the idea was, if we're going to have N of them driving down The Strip, it would be more efficient to join them physically together than to have them maintain normal inter-car spacing.

And that could work, if the car in front can communicate power/brake/turn commands to the cars in the chain. And if you could dynamically drop cars out of the middle when needed. And if you could dynamically add cars when they're neighboring and going the same way. All those could be tricky, but they seem quite solvable.