A paternoster or paternoster lift is a passenger elevator which consists of a chain of open compartments (each usually designed for two persons) that move slowly in a loop up and down inside a building without stopping. Passengers can step on or off at any floor they like.

In Budapest you can find this kind of elevators at public buildings like building of ministries for example. This particular one is in the building of the Hungarian Railway Company (MÁV).

This video is from Berlin but the paternosters in Budapest are totally the same: