Cable cars are a type of public transportation that have been around since the 19th century. They are typically used in hilly or mountainous areas, and consist of a cable car suspended from an overhead cable that is driven by a motor. Gondolas, which are seven letters long, are a type of cable car that is open-air and often used for sightseeing. Trams, which are four letters long, are similar to cable cars but are usually powered by electricity and run on tracks. Telphers, which are also seven letters long, are a type of cable car that is suspended from a single cable and runs on a track.