Funicular

A funicular (from Latin, funiculus, the diminutive of funis, "rope") also called funicular railway, liable railway, inclined plane, or, in the United Kingdom, a rock face railway, is a type of self-contained cable railway in which a cable close to a pair of tram-like vehicles on rails moves them up and down a very steep slope, utilize one ascending and one descending tram cabin to counterbalance each other.
The basic principle of funicular operation is that two cars are attached to each other by a cable, which runs through a pulley at the top of the dispose. Counterbalancing of the two cars, with one ascending and one descending the slope—especially when transporting similar loads, such as passengers —minimizes the attractive effort needed to lift the ascending car.
The usual engineering practice is to splice the cable ends together thereby creating a constant cable loop. The cars are attached equidistantly at differing points on the cable loop. The cable is driven by any resources of winching at one end of the run, and held taut by a tensioning wheel at the other. Other sheeve wheels are employed to guide the cable to and from the drive device and the incline cars. Locomotion is formed by alternately reversing the direction of the drive mechanism so that the cars switch positions on the incline, that is, one up and one down.