An aerial tramway, sky tram, cable car, ropeway or aerial tram is a type of aerial lift which uses one or two stationary ropes for support while a third moving rope provides propulsion.[failed verification] With this form of lift, the grip of an aerial tramway cabin is fixed onto the propulsion rope and cannot be decoupled from it during operations.
In comparison to gondola lifts, aerial tramways generally provide lower line capacities and higher wait times.
Because of the proliferation of such systems in the Alpine regions of Europe, the French and German names, téléphérique and Seilbahn, respectively, are often also used in an English language context. Cable car is the usual term in British English, as in British English the word tramway generally refers to a railed street tramway while in American English, cable car may additionally refer to a cable-pulled street tramway with detachable vehicles; e.g., San Francisco's cable cars. As such, careful phrasing is necessary to prevent confusion.
It is also sometimes called a ropeway or even incorrectly referred to as a gondola lift. A gondola lift has cabins suspended from a continuously circulating cable whereas aerial trams simply shuttle back and forth on cables. In Japan, the two are considered as the same category of vehicle and called ropeway, while the term cable car refers to both grounded cable cars and funiculars. An aerial railway where the vehicles are suspended from a fixed track (as opposed to a cable) is known as a suspension railway.
An aerial tramway consists of one or two fixed cables (called track cables), one loop of cable (called a haulage rope), and one or two passenger or cargo cabins. The fixed cables provide support for the cabins while the haulage rope, by means of a grip, is solidly connected to the truck (the wheel set that rolls on the track cables). An electric motor drives the haulage rope which provides propulsion. Aerial tramways are constructed as reversible systems; vehicles shuttling back and forth between two end terminals and propelled by a cable loop which stops and reverses direction when the cabins arrive at the end stations. Aerial tramways differ from gondola lifts in that gondola lifts are considered continuous systems (cabins attached onto a circulating haul rope that moves continuously).
Two-car tramways use a jig-back system: A large electric motor is located at the bottom of the tramway so that it effectively pulls one cabin down, using that cabin's weight to help pull the other cabin up. A similar system of cables is used in a funicular railway. The two passenger or cargo cabins, which carry from 4 to over 150 people, are situated at opposite ends of the loops of cable. Thus, while one is coming up, the other is going down the mountain, and they pass each other midway on the cable span.
Some aerial trams have only one cabin, which lends itself better for systems with small elevation changes along the cable run.
The first design of an aerial lift was by Croatian polymath Fausto Veranzio and the first operational aerial tram was built in 1644 by Adam Wiebe in Gdańsk. It was moved by horses and used to move soil over the river to build defences. It is called the first known cable lift in European history and precedes the invention of steel cables. It is not known how long this lift was used. In any case, it would be another 230 years before Germany would get the second cable lift, this newer version equipped with iron wire cable.
Other mining systems were developed in the 1860s by Hodgson, and Andrew Smith Hallidie. Hallidie went on to perfect a line of mining and people tramways after 1867 in California and Nevada. See Hallidie ropeway.
In India Damodar Ropeways & Infra Limited (DRIL)  established in the year 1974 has been a pioneer in the construction business of Passenger & Material Ropeways. One of the first passengers "monocable detachable" ropeways made was of length 410m at a level difference of 244m. It was completed by DRIL in the year 1997 at Shri Naina Deviji hills,  at Himachal Pradesh, with capacity of 800 passengers per hour.
See also: Ropeway conveyor
Tramways are sometimes used in mountainous regions to carry ore from a mine located high on the mountain to an ore mill located at a lower elevation. Ore tramways were common in the early 20th century at the mines in North and South America. One can still be seen in the San Juan Mountains of the US state of Colorado.
Over one thousand mining tramways were built around the world—Spitsbergen, Russia, Alaska, Argentina, New Zealand and Gabon. This experience was replicated with the use of tramways in the First World War particularly on the Isonzo Front in Italy. The German firm of Bleichert built hundreds of freight and military tramways, and even built the first tourist tramway at Bolzano/Bozen, in then Tyrolian Austria in 1913.
Other firms entered the mining tramway business—Otto, Leschen, Breco Ropeways Ltd., Ceretti and Tanfani, and Riblet for instance. A major British contributor was Bullivant who became a constituent of British Ropes in 1924. The perfection of the aerial tramway through mining led to its application in other fields including logging, sugar fields, beet farming, tea plantations, coffee beans and guano mining. A resource on the history of aerial tramways in the mining industry is "Riding the High Wire, Aerial Mine Tramways in the West"
In the beginning of the 20th century the rise of the middle class and the leisure industry allowed for investment in sight-seeing machines. Prior to 1893 a combined goods and passenger carrying cableway was installed at Gibraltar. Initially its passengers were military personnel. An 1893 industry publication said of a two-mile system in Hong Kong that it "is the only wire tramway which has been erected exclusively for the carriage of individuals" (albeit workmen). After the pioneer cable car of 1907 at Mount Ulia (San Sebastián, Spain) by Torres Quevedo others to the top of high peaks in the Alps of Austria, Germany and Switzerland resulted. They were much cheaper to build than the earlier rack railway.
One of the first trams was at Chamonix, while others in Switzerland and Garmisch soon followed. From this, it was a natural transposition to build ski lifts and chairlifts. The first cable car in North America was at Cannon Mountain in Franconia, New Hampshire in 1938. After the Second World War installations proliferated in Europe, America, Japan, Canada and South Africa. Many hundreds of installations have emerged in mountainous and seascape areas.
The aerial tram evolves again in latter decades—one tram in Costa Rica was built to move tourists above a rainforest, while one in Portland, Oregon, was built to move commuters. Presently, the mining role of tramways has lessened, though some still work, and moving people remains a starring role for the device.
Many aerial tramways were built by Von Roll Ltd. of Switzerland, which has since been acquired by Austrian lift manufacturer Doppelmayr. Other German, Swiss, and Austrian firms played an important role in the cable car business: Bleichert, Heckel, Pohlig, PHB (Pohlig-Heckel-Bleichert), Garaventa and Waagner-Biró. Now there are three groups dominating the world market: Doppelmayr Garaventa Group, Leitner Group, and Poma, the last two being owned by one person.
Some aerial tramways have their own propulsion, such as the Lasso Mule or the Josef Mountain Aerial Tramway near Merano, Italy.
While typically used for ski resorts, aerial tramways have been ported over for usage in the urban environment in recent times. The Roosevelt Island Tramway in New York City and the Portland Aerial Tram are examples where this technology has been successfully adapted for public transport purposes.
One offshoot of the aerial tram was the telpher system. This was an overhead railway, which was electrically powered. The carrier basket had a motor and two contacts on two rails. They were primarily used in English railway and postal stations. The original version was called telpherage. Smaller telpherage systems are sometimes used to transport objects such as tools or mail within a building or factory.
The telpherage concept was first publicised in 1883 and several experimental lines were constructed. It was not designed to compete with railways, but with horses and carts.
The first commercial telpherage line was in Glynde, which is in Sussex, England. It was built to connect a newly opened clay pit to the local railway station and opened in 1885.
There are aerial tramways with double deck cabins. The Vanoise Express cable car carries 200 people in each cabin at a height of 380 m (1,247 ft) over the Ponturin gorge in France. The Shinhotaka Ropeway carries 121 people in each cabin at Mount Hotaka in Japan. The CabriO cable car to the summit of the Stanserhorn in Switzerland carries 60 persons, with the upper floor accommodating 30 people in the open air.
See also: Gondola lift § List of accidents
Despite the introduction of various safety measures (back-up power generators, evacuation plans, etc.) there have been several serious incidents on aerial tramways, some of which were fatal.