There seems to be something unusual about the way they use this BN caboose.
It's the short-lived "Hoverboose" concept, intended to cut back on fuel use. They couldn't get reliable flux capacitors back then, so the idea was shelved.
Mitch
you could say they FLOATED the idea but it didn't take off
To be fair, they really did try.
That guy with the tether rope is braver than me