spin-stop: A stop on a non-axial habitat (or occasionally starship) internal transit line for access to a spin gravity area.

While in many cases the most convenient way to allow access to a gravity wheel or rotating segment within an otherwise non-rotating habitat is an axial transit line (or, in small examples, floatway), this is not universally the case.

In such examples, the spin-stop, a loop of track parallel to the spin section, serves to provide access. As the name suggests, rather than the train or transpod stopping at the station, as it would elsewhere, it simply comes to a stop relative to the spin, having entered the loop in synchronization with the rotating station. That is to say, while at a spin-stop, the vehicle is actually continuing to move at the tangential velocity of the spin section; typically, dozens to hundreds of miles per hour.

This is imperceptible to those boarding or departing the vehicle, of course, since the relative motion is the relevant motion. However, passengers unfamiliar with spin-stops should be aware that in many designs the vehicle cannot hold its departure for errant passengers, and the consequence of not standing clear of the closing doors are inevitably rather messy.

– A Star Traveler’s Dictionary