A small Vulcan passenger shuttle carried at warp by a detachable drive sled, the craft that brings Spock to the refitted Enterprise in Star Trek: The Motion Picture.
The craft is in two parts: a compact cabin section, and a much longer sled with two warp nacelles to which it is attached for interstellar travel. On arrival the cabin separates and flies on thrusters to dock.
In Star Trek: The Motion Picture a shuttle of this kind, named Surak, overtakes the Enterprise while it is on its way to intercept V'Ger. Chekov reports a courier asking permission to come alongside, and the cabin section docks at an airlock behind the bridge. The passenger is Spock, who has abandoned the Kolinahr ritual on Vulcan after sensing the consciousness of V'Ger. He comes aboard coldly, takes over the science station and helps Scotty fix the faulty warp engines.