Automated Guideway Transit
Automated Guideway Transit or AGT is the industry term for a type of transit system often mislabeled as a train. AGTs are fully automated by definition, usually use relatively small vehicles on relatively small systems, and usually do not actually use metal flange wheels on rails like trains do - instead, they usually use rubber truck tires with one of several types of guided steering. As a result, they do not run on rails, but instead on “guideways”.
AGTs are a lower-cost and reduced-infrastructure option for small automated transit systems, and so are usually used as people-movers at airports. amusement parks, and other large facilities that require easy and comfortable transportation. In fact, airports are the classic place to find AGTs, and of airports that I frequent SFO, LAS, and DFW all have AGTs.