A cable car (usually known as a cable tram outside North America) is a type of cable railway used for mass transit in which rail cars are hauled by a continuously moving cable running at a constant speed. Individual cars stop and start by releasing and gripping this cable as required. Cable cars are distinct from funiculars, where the cars are permanently attached to the cable.
Winding drums on the London and Blackwall cable-operated railway, 1840Cable Driving Plant, Designed and Constructed by Poole & Hunt, Baltimore, MD. Drawing by P.F. Goist, circa 1882. The powerhouse has two horizontal single-cylinder engines. The lithograph shows a hypothetical prototype of a cable powerhouse, rather than any actual built structure. Poole & Hunt, machinists and engineers, was a major cable industry designer and contractor and manufacturer of gearing, sheaves, shafting and wire rope drums. They did work for cable railways in Baltimore, Chicago, Hoboken, Kansas City, New York, and Philadelphia.
The first cable-operated railway, employing a moving rope that could be picked up or released by a grip on the cars was the Fawdon Wagonway in 1826, a colliery railway line.[3][4] The London and Blackwall Railway, which opened for passengers in east London, England, in 1840 used such a system.[5] The rope available at the time proved too susceptible to wear and the system was abandoned in favour of steam locomotives after eight years. In America, the first cable car installation in operation probably was the West Side and Yonkers Patent Railway in New York City, as its first-ever elevated railway which ran from 1 July 1868 to 1870. The cable technology used in this elevated railway involved collar-equipped cables and claw-equipped cars, proving cumbersome. The line was closed and rebuilt, reopening with steam locomotives.
Other cable cars to use grips were those of the Clay Street Hill Railroad, which later became part of the San Francisco cable car system. The building of this line was promoted by Andrew Smith Hallidie with design work by William Eppelsheimer, and it was first tested in 1873. The success of these grips ensured that this line became the model for other cable car transit systems, and this model is often known as the Hallidie Cable Car.
In 1881 the Dunedin cable tramway system opened in Dunedin, New Zealand and became the first such system outside San Francisco. For Dunedin, George Smith Duncan further developed the Hallidie model, introducing the pull curve and the slot brake; the former was a way to pull cars through a curve, since Dunedin's curves were too sharp to allow coasting, while the latter forced a wedge down into the cable slot to stop the car. Both of these innovations were generally adopted by other cities, including San Francisco.
In Australia, the Melbourne cable tramway system operated from 1885 to 1940. It was one of the most extensive in the world with 1200 trams and trailers operating over 15 routes with 103km (64 miles) of track. Sydney also had a couple of cable tram routes.
Cable cars rapidly spread to other cities, although the major attraction for most was the ability to displace horsecar (or mule-drawn) systems rather than the ability to climb hills. Many people at the time viewed horse-drawn transit as unnecessarily cruel, and the fact that a typical horse could work only four or five hours per day necessitated the maintenance of large stables of draft animals that had to be fed, housed, groomed, medicated and rested. Thus, for a period, economics worked in favour of cable cars even in relatively flat cities.
For example, the Chicago City Railway, also designed by Eppelsheimer, opened in Chicago in 1882 and went on to become the largest and most profitable cable car system. As with many cities, the problem in flat Chicago was not one of incline, but of transportation capacity. This caused a different approach to the combination of grip car and trailer. Rather than using a grip car and single trailer, as many cities did, or combining the grip and trailer into a single car, like San Francisco's California Cars, Chicago used grip cars to pull trains of up to three trailers.
In 1883 the New York and Brooklyn Bridge Railway was opened, which had a most curious feature: though it was a cable car system, it used steam locomotives to get the cars into and out of the terminals. After 1896 the system was changed to one on which a motor car was added to each train to maneuver at the terminals, while en route, the trains were still propelled by the cable.
A San Francisco cable car travels along California Street in the city's Financial District.
On 25 September 1883, a test of a cable car system was held by Liverpool Tramways Company in Kirkdale, Liverpool. This would have been the first cable car system in Europe, but the company decided against implementing it. Instead, the distinction went to the 1884 Highgate Hill Cable Tramway, a route from Archway to Highgate, north London, which used a continuous cable and grip system on the 1 in 11 (9%) climb of Highgate Hill. The installation was not reliable and was replaced by electric traction in 1909.[9] Other cable car systems were implemented in Europe, though, among which was the Glasgow District Subway, the first underground cable car system, in 1896. (London, England's first deep-level tube railway, the City & South London Railway, had earlier also been built for cable haulage but had been converted to electric traction before opening in 1890.) A few more cable car systems were built in the United Kingdom, Portugal, and France. European cities, having many more curves in their streets, were ultimately less suitable for cable cars than American cities.
Though some new cable car systems were still being built, by 1890 the cheaper to construct and simpler to operate electrically-powered trolley or tram started to become the norm, and eventually started to replace existing cable car systems. For a while hybrid cable/electric systems operated, for example in Chicago where electric cars had to be pulled by grip cars through the loop area, due to the lack of trolley wires there. Eventually, San Francisco became the only street-running manually operated system to survive–Dunedin, the second city with such cars, was also the second-last city to operate them, closing down in 1957.
Recent revival
In the last decades of the 20th-century, cable traction in general has seen a limited revival as automatic people movers, used in resort areas, airports (for example, Toronto Airport), huge hospital centers and some urban settings. While many of these systems involve cars permanently attached to the cable, the Minimetro system from Poma/Leitner Group and the Cable Liner system from DCC Doppelmayr Cable Car both have variants that allow the cars to be automatically decoupled from the cable under computer control, and can thus be considered a modern interpretation of the cable car.
Operation
Machinery driving the San Francisco cable car systemThe cable slot lies centered between the two rails of the track, providing an ingress for the grip, 1970.
The cable is itself powered by a stationary engine or motor situated in a cable house or power house. The speed at which it moves is relatively constant depending on the number of units gripping the cable at any given time.
The cable car begins moving when a clamping device attached to the car, called a grip, applies pressure to ("grip") the moving cable. Conversely, the car is stopped by releasing pressure on the cable (with or without completely detaching) and applying the brakes. This gripping and releasing action may be manual, as was the case in all early cable car systems, or automatic, as is the case in some recent cable operated people mover type systems. Gripping must be applied evenly and gradually in order to avoid bringing the car to cable speed too quickly and unacceptably jarring passengers.
In the case of manual systems, the grip resembles a very large pair of pliers, and considerable strength and skill are required to operate the car. As many early cable car operators discovered the hard way, if the grip is not applied properly, it can damage the cable, or even worse, become entangled in the cable. In the latter case, the cable car may not be able to stop and can wreak havoc along its route until the cable house realizes the mishap and halts the cable.[10]
One apparent advantage of the cable car is its relative energy efficiency. This is due to the economy of centrally located power stations, and the ability of descending cars to transfer energy to ascending cars. However, this advantage is totally negated by the relatively large energy consumption required to simply move the cable over and under the numerous guide rollers and around the many sheaves. Approximately 95% of the tractive effort in the San Francisco system is expended in simply moving the four cables at 15.3km/h (9.5mph).[11] Electric cars with regenerative braking do offer the advantages, without the problem of moving a cable. In the case of steep grades, however, cable traction has the major advantage of not depending on adhesion between wheels and rails. There is also the advantage that keeping the car gripped to the cable will also limit the downhill speed of the car to that of the cable.
Because of the constant and relatively low speed, a cable car's potential to cause harm in an accident can be underestimated. Even with a cable car traveling at only 14km/h (9mph), the mass of the cable car and the combined strength and speed of the cable can cause extensive damage in a collision.
Relation to funiculars
A cable car is superficially similar to a funicular, but differs from such a system in that its cars are not permanently attached to the cable and can stop independently, whereas a funicular has cars that are permanently attached to the propulsion cable, which is itself stopped and started. A cable car cannot climb as steep a grade as a funicular, but many more cars can be operated with a single cable, making it more flexible, and allowing a higher capacity. During the rush hour on San Francisco's Market Street Railway in 1883, a car would leave the terminal every 15 seconds.[12]
A few funicular railways operate in street traffic, and because of this operation are often incorrectly described as cable cars. Examples of such operation, and the consequent confusion, are:
Even more confusingly, a hybrid cable car/funicular line once existed in the form of the original Wellington Cable Car, in the New Zealand city of Wellington. This line had both a continuous loop haulage cable that the cars gripped using a cable car gripper, and a balance cable permanently attached to both cars over an undriven pulley at the top of the line. The descending car gripped the haulage cable and was pulled downhill, in turn pulling the ascending car (which remained ungripped) uphill by the balance cable. This line was rebuilt in 1979 and is now a standard funicular, although it retains its old cable car name.
List of cable car systems
Cities currently operating cable cars
Traditional cable car systems
The best-known existing cable car system is the San Francisco cable car system in the city of San Francisco, California. San Francisco's cable cars constitute the oldest and largest such system in permanent operation, and it is one of the few still functioning in the traditional manner, with manually operated cars running in street traffic. Other examples of cable powered systems can be found on the Great Orme in North Wales, and in Lisbon in Portugal. All of these however are slightly different to San Francisco in that the cars are permanently attached to the cable.
Modern cable car systems
Several cities operate a modern version of the cable car system. These systems are fully automated and run on their own reserved right of way. They are commonly referred to as people movers, although that term is also applied to systems with other forms of propulsion, including funicular style cable propulsion.
A Seattle cable car in 1940, just before service ended. Seattle was the last city in the U.S. to abandon all its street cable railways, with the last three lines all closing in 1940, leaving San Francisco as the only U.S. city where cable cars continued to operate.
A funicular is a type of cable railway system that connects points along a railway track laid on a steep slope. The system is characterized by two counterbalanced carriages permanently attached to opposite ends of a haulage cable, which is looped over a pulley at the upper end of the track. The result of such a configuration is that the two carriages move synchronously: as one ascends, the other descends at an equal speed. This feature distinguishes funiculars from inclined elevators, which have a single car that is hauled uphill.
Cable transport is a broad class of transport modes that have cables. They transport passengers and goods, often in vehicles called cable cars. The cable may be driven or passive, and items may be moved by pulling, sliding, sailing, or by drives within the object being moved on cableways. The use of pulleys and balancing of loads moving up and down are common elements of cable transport. They are often used in mountainous areas where cable haulage can overcome large differences in elevation.
An aerial tramway, aerial tram, sky tram, aerial cablecar, aerial cableway, telepherique, or seilbahn is a type of aerial lift which uses one or two stationary ropes for support while a third moving rope provides propulsion. 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.
The San Francisco cable car system is the world's last manually operated cable car system and an icon of the city of San Francisco. The system forms part of the intermodal urban transport network operated by the San Francisco Municipal Railway, which also includes the separate E Embarcadero and F Market & Wharves heritage streetcar lines, and the Muni Metro modern light rail system. Of the 23 cable car lines established between 1873 and 1890, only three remain : two routes from downtown near Union Square to Fisherman's Wharf, and a third route along California Street.
The Dunedin cable tramway system was a group of cable tramway lines in the New Zealand city of Dunedin. It is significant as Dunedin was the second city in the world to adopt the cable car.
The Chicago City Railway Company (CCRy) was an urban transit company that operated horse, cable, and electric streetcars on Chicago's South Side between 1859 and 1914, when it became merged into and part of the Chicago Surface Lines (CSL) metropolitan-wide system. After that time it owned electric streetcars, along with gasoline, diesel, and propane – fueled transit busses. Purchased by the government agency Chicago Transit Authority (CTA) in 1947, it was liquidated in 1950.
William Eppelsheimer was a tramway engineer known for his work on cable car systems. He was born in Alzey in Germany and studied engineering at the Polytechnikum Karlsruhe. in 1868 he left Germany by ship from Bremerhaven for the United States. Arriving in New York he changed his German first name Wilhelm to William,
Urban rail transit is a wide term for various types of local rail systems providing passenger service within and around urban or suburban areas. The set of urban rail systems can be roughly subdivided into the following categories, which sometimes overlap because some systems or lines have aspects of multiple types.
Andrew Smith Hallidie was an American entrepreneur who was the promoter of the Clay Street Hill Railroad in San Francisco. This was the world's first practical cable car system, and Hallidie is often therefore regarded as the inventor of the cable car and father of the present day San Francisco cable car system, although both claims are open to dispute. He also introduced the manufacture of wire rope to California, and at an early age was a prolific builder of bridges in the Californian interior.
The Clay Street Hill Railroad was the first successful cable hauled street railway. It was located on Clay Street, a notably steep street in San Francisco in California, United States, and first operated in August 1873.
The Melbourne cable tramway system was a cable car public transport system, which operated between 1885 and 1940 in Melbourne, Victoria, Australia.
The Great Orme Tramway is a cable-hauled 3 ft 6 in gauge tramway in Llandudno in north Wales. Open seasonally from late March to late October, it takes over 200,000 passengers each year from Llandudno Victoria Station to just below the summit of the Great Orme headland. From 1932 onwards it was known as the Great Orme Railway, reverting to its original name in 1977.
The Market Street Railway Company was a commercial streetcar and bus operator in San Francisco. The company was named after the famous Market Street of that city, which formed the core of its transportation network. Over the years, the company was also known as the Market Street Railroad Company, the Market Street Cable Railway Company and the United Railroads of San Francisco. Once the largest transit operator in the city, the company folded in 1944 and its assets and services were acquired by the city-owned San Francisco Municipal Railway. Many of the former routes continue to exist into the 2020s, but served by buses.
The Wellington Cable Car is a funicular railway in Wellington, New Zealand, between Lambton Quay, the main shopping street, and Kelburn, a suburb in the hills commanding views overlooking the central city, rising 120 m (394 ft) over a length of 609 m (1,998 ft).
Streetcars were part of the public transit service in Kenosha, Wisconsin, in the first third of the 20th century, and returned to this role in the year 2000.
A cable grip is a device for propelling a vehicle by attaching to a wire rope running at a (relatively) constant speed. The vehicle may be suspended from the cable, as in the case of aerial lifts such as a gondola lift (télécabine), may be guided by rails, as in a cable traction railway, or may be self-guiding, as in a button lift. Typically, multiple vehicles will use the same cable; where just one or two vehicles are in use they will tend to be attached to the cable permanently such as in funiculars.
The history of trams, streetcars, or trolleys began in the early nineteenth century. It can be divided up into several discrete periods defined by the principal means of motive power used.
The Belleville funicular tramway was a cable car which from 1891 to 1924 connected the Place de la République in Paris to the Église Saint-Jean-Baptiste de Belleville, on a hill in the Belleville quarter. It has since been demolished.
A California Car is a type of single-deck tramcar or streetcar that features a center, enclosed seating compartment and roofed seating areas without sides on either end. These cars were popular in California's mild Mediterranean climate offering passengers a choice of shaded outdoor seating during hot weather, or more protected seating during cool or rainy weather. They were also used in other climates to provide separate outdoor smoking and enclosed non-smoking areas. Some very early motor buses also used the combination car design.
The Highgate Hill Cable Tramway was the first cable tramway in Europe. Opened in 1884, it was built to demonstrate the benefits of the technology first pioneered in San Francisco.
References
Specific
↑ Hilton, George W. (1971). The Cable Car in America. Berkeley, CA.: Howell NorthBooks.
↑ "The Cable in Chicago: Speeding along the Streets Rapid Transit there for Miles". The Baltimore Sun. Nov 9, 1889. p.8.
↑ Robertson, Andrew (March 1848). "Blackwall Railway Machinery". The Civil Engineer and Architect's Journal. 11. New York: Wiley & Putnam.
↑ James Guilbeau (2011). St. Charles Streetcar, The: Or, the New Orleans & Carrollton Railroad. Pelican Publishing Company. pp.48–49. ISBN9781879714021.
↑ Louis C. Hennick; Elbridge Harper Charlton (1965). The Streetcars of New Orleans. Pelican Publishing. p.16. ISBN9781455612598.
Of Cables and Grips: The Cable Cars of San Francisco, by Robert Callwell and Walter Rice, published by Friends of the Cable Car Museum, first edition, 2000.
Chicago Cable Cars, by Greg Borzo, published by The History Press (2012), ISBN978-1-60949-327-1
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