It sounds like we need an RFC for automated packet-switched transport of physical goods. Surely the existing algorithms used for physical logistics and IP network routing could be used to create a highly-reliable automatic package delivery system.
The closest I can think of is Personal Rapid Transport[1],
which is a light-rail/monorail network of individually powered (small; 3-person or so) vehicles. Various schemes for routing have been proposed, many of which are conceptually similar to packet-routing of the carriages.
