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Ground-level power supply

February 16, 2024

Ground-level power supply, also known as surface current collection or, in French, alimentation par le sol ("feeding via the ground"), is a concept and group of technologies whereby electric vehicles collect electric power at ground level from individually-powered segments instead of the more common overhead lines. Ground-level power supply was developed for aesthetic reasons, to avoid the presence of overhead lines in city centres.

Bordeaux tramway with ground-level power supply

Ground-level power supply systems date to the beginning of electric tramways, with some of the earliest such systems using conduit current collection. Since the turn of the 21st century, systems such as the Alstom APS, Ansaldo Tramwave, CAF ACR, and Elways have been introduced that use modern technology to eliminate some limits and dangers of the older systems, and to supply power for buses, trucks, and electric cars. With the increased efficiency and energy density of capacitor- and battery-powered systems, ground-level power supply systems are used in smaller portions of the line to charge batteries—for example, during station stops for buses and trains.

Early systems edit

 
Conduit for current collection between the rails of streetcars in Washington, D.C., 1939. First installed in 1895,[1] it remained in operation until 1962[2]
 
Remaining conduit tram track on the ramp to the abandoned Kingsway tram subway in London, with plants growing in the conduit

Conduit current collection systems were implemented as early as 1881 with the Gross-Lichterfelde Tramway.[3]: Appendix I  The system is primarily composed of a channel, or conduit, excavated under the roadway; the conduit is positioned either between the running rails, much in the same fashion as the cable for cable cars,[4] or underneath one of the rails; a car is connected to a "plow" that runs through the conduit and delivers power from two electric rails at the sides of the conduit to the car's electric motor.[5] Plows were manually attached and detached from cars as they switched rail lines.[4]

Cleveland opened a conduit line in 1885.[1] Tram companies in Budapest trialed a conduit current collector system in 1887. Overhead lines were met with public opposition for aesthetic reasons, so the contractor Siemens-Halske implemented a concrete conduit underneath one of the trolley rails, with a narrow opening that allowed a "plow" to be inserted and make electrical contact with wires held by insulators at either side of the conduit. The system was used in several cities in Europe and the United States, where it was known as the "Budapest System".[5][6] Washington, D.C. installed its first conduit current collection system in 1895. By 1899 all downtown lines were converted to the conduit system, which remained in operation until 1962.[1] The system was generally safe, but tended to get clogged by mud and dirt. The system fell out of favor within a few years due to the cost of excavating the conduit, and was generally replaced with overhead lines.[5]

Stud contact systems were implemented from 1899 to 1921. Systems by the inventors Dolter and Diatto were used in Tours, Paris, and several towns in England. Power was supplied from studs set in the road at intervals, which connected to the traveling cars with contact shoes or contact skis. The studs were cylinders with their tops flush with the road surface. Underneath there was a switch mechanism that made an electrical connection with the top of the stud when a car with a strong electromagnet at its underside passed over it. The Diatto switches contained mercury, which often leaked or adhered to the side of the cylinder and kept the exposed top electrified. The Dolter switches used pivot arms, which tended to get stuck in the electrified position. Similar systems were operated by Thomson-Houston in Monaco from 1898 to 1903, and by František Křižík in Prague on the King Charles Bridge from 1903 to 1908.[3]: 109–116  Stud contact systems were short-lived due to safety issues.[7]

Conduit current collection systems were used in several major cities, including Monaco, Dresden, Prague, Tours, Washington, and London,[3]: 44  but posed maintenance issues and road safety issues. The Bordeaux and Washington conduit systems remained the last in operation until being decommissioned in 1958[7] and 1962,[2] respectively. For decades, these systems were not reintroduced because they didn't meet modern safety standards.[7]

Modern systems edit

A number of ground-level power supply systems were developed from the 1970s through the 1990s,[8] but were not reliable or safe enough for commercial use.[9]

The first ground-level power supply system developed to modern safety standards was the Ansaldo Stream,[7] although a competing system, Alstom APS, was the first to be commercially implemented in 2003. This success led to a proliferation of commercial implementations of ground-level power supply systems.[10]

During the late 2010s, advancements in technology led to ground-level power supplies seeing increasing reliability and economic feasibility. [11]

Electric road systems edit

Sweden edit

See also: Swedish Transport Administration electric road program

 
Electric truck driving on a public road with Elways-Evias ground-level power supply, near Arlanda airport, 2019.

Electric roads power and charge electric vehicles while driving. Sweden has tested electric road systems that charge the batteries of trucks and electric cars, and among the tested systems are two ground-level power supply systems tested since 2017, in-road rail by Elways-Evias and on-road rail by Elonroad.[12] Elonroad later developed an in-road rail system for highway use at speeds up to 130 kilometres per hour (81 mph).[13] The systems were found to be more economical than the tested overhead line system and dynamic inductive charging system. The in-road rail system is planned to deliver up to 800 kW per vehicle traveling over a powered segment of the rail, and the system is estimated to be the most cost-effective among the four tested systems. The new systems are expected to be safe, with segments of the rail being powered only when a vehicle is traveling over them.[14] The rails have been tested while submerged in salt water and were found to be safe for pedestrians.[15]

France edit

See also: Transport in France § Electric roads

The co-director for one of the French Ministry of Ecology working groups on electric road systems stated that rail-based ERS are the most advantageous, though the specific rail technology has yet to be standardized. France plans to invest 30 to 40 billion euro by 2035 in an electric road system spanning 8,800 kilometers. Ground-level power supply technologies are considered the most likely candidates for electric roads.[16] Two projects for assessment of electric road technologies have been announced in 2023. The first French public road with an electric road system is planned to open in 2024 using a ground-level power supply system derived from Alstom APS.[17] The second, with technology developed by Elonroad, is scheduled to undergo laboratory testing for skid effects on motorcycles before being deployed along two kilometers on the A10 autoroute south of Paris.[13]

Standardization edit

Alstom, Elonroad, and other companies have, in 2020, begun drafting a standard for ground-level power supply electric roads.[18][19] The European Commission published in 2021 a request for regulation and standardization of electric road systems.[20] Shortly afterward, a working group of the French Ministry of Ecology recommended adopting a European electric road standard formulated with Sweden, Germany, Italy, the Netherlands, Spain, Poland, and others.[21]

The first standard for electrical equipment on board a vehicle powered by a rail electric road system (ERS) has been published in late 2022.[22] The standard, CENELEC Technical Standard 50717, specifies the following: an ERS voltage of 750 volts; a contact shoe capable of withstanding impact of gravel and similar road debris at the maximum operating speed; a weak link that breaks off the current collector at the structural fixing points if the force is larger than the maximum specified by the vehicle manufacturer; automatic monitoring of the presence of ERS infrastructure; automatic engagement and disengagement; a presence signal that may be analog or digital, and optional standard bidirectional communication; ease of inspection and replacement for the wearing parts of the sliding contact; and standard tests, markings, maintenance, and operational environment conditions.[23] The 50717 standard does not encompass, but specifies for normative purposes, three architectures for ERS infrastructure: Type A architecture with two parallel surface-level conductive rails, one positive and one negative; Type B architecture with a single surface-level or raised track with short segments where each two segments in series consist of one positive and one negative segment; and Type C architecture with three parallel conductive rails, one positive and one negative below surface level in 1.5 cm wide channels, and one or more rails earthed at surface level.[23]

Following standards, encompassing "full interoperability" and a "unified and interoperable solution" for ground-level power supply, are scheduled to be published by the end 2024, detailing complete "specifications for communication and power supply through conductive rails embedded in the road".[24][25]

Modern implementations edit

Ansaldo Stream edit

The first modern ground-level power supply system to be developed is the Ansaldo Stream system. STREAM is an acronym that stands for "Sistema di TRasporto Elettrico ad Attrazione Magnetica", meaning "System of Electric Transport by Magnetic Attraction". The system uses a channel in the road made of insulating composite fiberglass material which contains a flexible copper strip; a vehicle passing over the channel with a special magnetic contact shoe raises the conductor to the surface, allowing power to flow to the vehicle. Segments of the strip are powered only when a vehicle passes over them. The system was developed in 1994[26] and trialed on a public tram line in 1998,[7] which was eventually dismantled in 2012.[27]

Alstom APS edit

 
A section of APS track showing the neutral sections at the end of the powered segments plus one of the insulating joint boxes which mechanically and electrically join the APS rail segments (Bordeaux)

Alstom APS uses a third rail placed between the running rails, divided electrically into 11-metre segments. These segments automatically switch on or off by radio control according to whether a tram is passing over them, thereby eradicating any risk to other road users. The tram has two collector shoes, and two segments of rail are active at any given time, to avoid interruption of power when passing between segments. APS was developed by Innorail, a subsidiary of Spie Enertrans but was sold to Alstom when Spie was acquired by Amec. It was originally created for the Bordeaux tramway, which was constructed from 2000 and opened in 2003, becoming the first modern commercial ground-level power supply system. From 2011, the technology has been used in a number of other cities around the world.[28][29]

The French government reports no electrocutions or electrification accidents on any tramway in France from as early as 2003[30] until as recently as December 31, 2020.[30][31]

Alstom further developed the APS system for use with buses and other vehicles.[32] The system has been tested for compatibility with snow plows and for safety under exposure to snow, ice, salting, and saturated brine.[33] Alstom will trial its electric road system on a public road in the Rhône-Alpes region between 2024 and 2027.[17]

CAF ACR edit

 
CAF ACR-equipped Urbos 3 tram running through central Seville, 2015. The tram is powered by supercapacitors charged by a ground-level power supply.

Construcciones y Auxiliar de Ferrocarriles (CAF) trialed its Acumulador de Carga Rápida (ACR) ground-level power supply system in 2007 in Seville. Sections of the Seville MetroCentro tramway around the Seville Cathedral were converted to the ACR ground-level power supply system. ACR's first commercial installation was aboard Urbos trams supplied to MetroCentro in 2011, allowing the permanent removal of overhead lines around the cathedral.[34]

Line 1 of the Tranvía de Zaragoza has also used ACR since its second construction phase was completed in 2013. The use of ACR avoided the installation of overhead lines in the city's historic centre.[35][36]

ACR was included in the Newcastle Light Rail in Australia and Luxembourg's new tram system.[37][38]

Ansaldo Tramwave edit

Derived from Ansaldo Stream and developed by Italian company Ansaldo STS (which later became Hitachi Rail STS), the Ansaldo TramWave ground-level power supply system successfully entered commercial application in 2017, with the opening of Zhuhai tram Line 1 first phase in China. The tram is the first fully low-floor tram system adopting ground level power supply technology.[39] Later in 2017, Western Suburb Line in Beijing was opened with the same technology from Ansaldo.[40] The technology has been licensed to CRRC Dalian and all the technologies were transferred to China.[41]

References edit

  1. ^ a b c John H. White, Jr., "Public Transport in Washington before the Great Consolidation of 1902", Records of the Columbia Historical Society, Washington, D.C., 66/68 (46): 216–230
  2. ^ a b Jack W. Boorse (January 2005), "Directly and Indirectly Reducing Visual Impact of Electric Railway Overhead Contact Systems", Transportation Research Record, 1930 (1), doi:10.1177/0361198105193000107
  3. ^ a b c Gerry Colley (November 27, 2014), Electrifying the streets: the surface-contact controversy in give English towns 1880-1920 (PDF), doi:10.21954/ou.ro.0000d65c
  4. ^ a b Dewi Williams (2004), London Trams: current collectors (ploughs)
  5. ^ a b c Eric Schatzberg (2001), Culture and Technology in the City: Opposition to Mechanized Street Transportation in Late-Nineteenth-Century America, MIT Press
  6. ^ Legát, Tibor; Zsolt L. Nagy; Gábor Zsigmond (2010). "Bevezető [Introduction]". Számos villamos [Numbered tram] (in Hungarian). Budapest: Jószöveg. pp. 6–12. ISBN 978-615-5009-15-0.
  7. ^ a b c d e J Baggs (March 9, 2006), "5.1 Ground Level Power Supply", Wire-Free Traction System Technology Review (PDF), Edinburgh Tram Network
  8. ^ John D Swanson (2003), "Ground level switched contact systems", Light Rail Without Wires - A Dream Come True? (PDF), Transportation Research Board
  9. ^ Michael P. Hennessey (January 1994), Evaluation of the E-TRAN Vehicle Propulsion Concept (PDF), Minnesota Department of Transportation, pp. 11–12
  10. ^ John D. Swanson (April 7, 2019), "Continued Advances in Light Rail / Streetcar Vehicle Off-Wire Technology" (PDF), Transportation Research Board
  11. ^ Guerrieri, M. (2019), "Catenary-Free Tramway Systems: Functional and Cost–Benefit Analysis for a Metropolitan Area.", Urban Rail Transit (5): 289–309, doi:10.1007/s40864-019-00118-y
  12. ^ D Bateman; et al. (October 8, 2018), Electric Road Systems: a solution for the future (PDF), TRL, pp. 146–149
  13. ^ a b Léna Corot (August 30, 2023), "Vinci teste la recharge par induction et par rail sur autoroute", L'USINENOUVELLE.com
  14. ^ Analysera förutsättningar och planera för en utbyggnad av elvägar, Swedish Transport Administration, February 2, 2021, pp. 21–23, 25–26, 54
  15. ^ Daniel Boffey (April 12, 2018), "World's first electrified road for charging vehicles opens in Sweden", The Guardian
  16. ^ Laurent Miguet (April 28, 2022), "Sur les routes de la mobilité électrique", Le Moniteur
  17. ^ a b Jean-Philippe Pastre (June 30, 2023), "L'APS d'Alstom bientôt testé sur les routes", TRM24
  18. ^ PIARC (February 17, 2021), Electric Road Systems - PIARC Online Discussion, 34 minutes 34 seconds, 2 hours 36 minutes 51 seconds, archived from the original on December 22, 2021
  19. ^ Martin G. H. Gustavsson, ed. (March 26, 2021), "Key Messages on Electric Roads - Executive Summary from the CollERS Project" (PDF), CollERS, p. 6, retrieved February 11, 2022
  20. ^ European Commission (July 14, 2021), Proposal for a REGULATION OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU of the European Parliament and of the Council
  21. ^ Patrick Pélata; et al. (July 2021), (PDF), archived from the original (PDF) on October 21, 2021
  22. ^ , The British Standards Institution, 2022, archived from the original on January 2, 2023, retrieved January 2, 2023
  23. ^ a b CENELEC Technical Standard 50717, CLC/TS 50717:2022 (E). Technical Requirements for Current Collectors for ground-level feeding system on road vehicles in operation
  24. ^ Final draft: Standardization request to CEN-CENELEC on ‘Alternative fuels infrastructure’ (AFI II) (PDF), European Commission, February 2, 2022
  25. ^ Matts Andersson (July 4, 2022), Regulating Electric Road Systems in Europe - How can a deployment of ERS be facilitated? (PDF), CollERS2 - Swedish German research collaboration on Electric Road Systems
  26. ^ Deutsch, Volker (2003), Einsatzbereiche neuartiger Transportsysteme zwischen Bus und Bahn (PDF), Bergischen Universität Wuppertal, pp. 209–214
  27. ^ "Partono i Lavori per la Rimozione delle Rotaie di Stream in via Mazzini", TriestePrima, 16 February 2012
  28. ^ "Third-rail trams across the Garonne". Railway Gazette International. February 1, 2004. Retrieved May 2, 2008.
  29. ^ "APS: Service-proven catenary-free tramway operations". Alstom. from the original on 2020-11-29. Retrieved 2020-11-29.
  30. ^ a b Service Technique des Remontées Mécaniques et des Transports Guidés - Division TramWays (November 2011), ACCIDENTOLOGIE DES TRAMWAYS - Analyse des évènements déclarés année 2010 - évolution 2003-2010 (PDF)
  31. ^ Service Technique des Remontées Mécaniques et des Transports Guidés - Division TramWays (October 19, 2021), Accidentologie « tramways » – Données 2020 (PDF)
  32. ^ "Alstom transfers tram power supply technology to buses". Rail Insider. 26 September 2019. from the original on 29 November 2020. Retrieved 29 November 2020.
  33. ^ Patrick Dupart (February 11, 2022), Compatibility of an in-road Electric Road System with winter service operations (PDF), Alstom, PIARC
  34. ^ Ameneiro, A. S. (2011-04-05). "Adiós a las catenarias en la Catedral". Diario de Sevilla (in Spanish). Seville. Retrieved July 16, 2018.
  35. ^ "Zaragoza tram Line 1 enters service". Railway Gazette International. London. 2011-04-26. Retrieved 2018-07-16.
  36. ^ Crespo Roig, María (2011-01-20). "CAF apuesta por que Zaragoza tenga un metro sin catenarias que funcione con la energía que recargue en las paradas". aragondigital.es (in Spanish). Zaragoza. Retrieved July 16, 2018.
  37. ^ "Newcastle light rail to be Australia's first 'wire-free' system". 19 April 2017.
  38. ^ "Newcastle Light Rail, Australia | Aurecon".
  39. ^ 历经磨难 全球首个地面供电的100%低地板现代有轨电车项目终成正果
  40. ^ 去颐和园、香山更方便啦！西郊线年底运营，还能和地铁换乘
  41. ^ 中国首次引进现代有轨电车技术(图)

External links edit

 
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February 16, 2024
ground, level, power, supply, also, known, surface, current, collection, french, alimentation, feeding, ground, concept, group, technologies, whereby, electric, vehicles, collect, electric, power, ground, level, from, individually, powered, segments, instead, . Ground level power supply also known as surface current collection or in French alimentation par le sol feeding via the ground is a concept and group of technologies whereby electric vehicles collect electric power at ground level from individually powered segments instead of the more common overhead lines Ground level power supply was developed for aesthetic reasons to avoid the presence of overhead lines in city centres Bordeaux tramway with ground level power supplyGround level power supply systems date to the beginning of electric tramways with some of the earliest such systems using conduit current collection Since the turn of the 21st century systems such as the Alstom APS Ansaldo Tramwave CAF ACR and Elways have been introduced that use modern technology to eliminate some limits and dangers of the older systems and to supply power for buses trucks and electric cars With the increased efficiency and energy density of capacitor and battery powered systems ground level power supply systems are used in smaller portions of the line to charge batteries for example during station stops for buses and trains Contents 1 Early systems 2 Modern systems 2 1 Electric road systems 2 1 1 Sweden 2 1 2 France 2 2 Standardization 3 Modern implementations 3 1 Ansaldo Stream 3 2 Alstom APS 3 3 CAF ACR 3 4 Ansaldo Tramwave 4 References 5 External linksEarly systems edit nbsp Conduit for current collection between the rails of streetcars in Washington D C 1939 First installed in 1895 1 it remained in operation until 1962 2 nbsp Remaining conduit tram track on the ramp to the abandoned Kingsway tram subway in London with plants growing in the conduitConduit current collection systems were implemented as early as 1881 with the Gross Lichterfelde Tramway 3 Appendix I The system is primarily composed of a channel or conduit excavated under the roadway the conduit is positioned either between the running rails much in the same fashion as the cable for cable cars 4 or underneath one of the rails a car is connected to a plow that runs through the conduit and delivers power from two electric rails at the sides of the conduit to the car s electric motor 5 Plows were manually attached and detached from cars as they switched rail lines 4 Cleveland opened a conduit line in 1885 1 Tram companies in Budapest trialed a conduit current collector system in 1887 Overhead lines were met with public opposition for aesthetic reasons so the contractor Siemens Halske implemented a concrete conduit underneath one of the trolley rails with a narrow opening that allowed a plow to be inserted and make electrical contact with wires held by insulators at either side of the conduit The system was used in several cities in Europe and the United States where it was known as the Budapest System 5 6 Washington D C installed its first conduit current collection system in 1895 By 1899 all downtown lines were converted to the conduit system which remained in operation until 1962 1 The system was generally safe but tended to get clogged by mud and dirt The system fell out of favor within a few years due to the cost of excavating the conduit and was generally replaced with overhead lines 5 Stud contact systems were implemented from 1899 to 1921 Systems by the inventors Dolter and Diatto were used in Tours Paris and several towns in England Power was supplied from studs set in the road at intervals which connected to the traveling cars with contact shoes or contact skis The studs were cylinders with their tops flush with the road surface Underneath there was a switch mechanism that made an electrical connection with the top of the stud when a car with a strong electromagnet at its underside passed over it The Diatto switches contained mercury which often leaked or adhered to the side of the cylinder and kept the exposed top electrified The Dolter switches used pivot arms which tended to get stuck in the electrified position Similar systems were operated by Thomson Houston in Monaco from 1898 to 1903 and by Frantisek Krizik in Prague on the King Charles Bridge from 1903 to 1908 3 109 116 Stud contact systems were short lived due to safety issues 7 Conduit current collection systems were used in several major cities including Monaco Dresden Prague Tours Washington and London 3 44 but posed maintenance issues and road safety issues The Bordeaux and Washington conduit systems remained the last in operation until being decommissioned in 1958 7 and 1962 2 respectively For decades these systems were not reintroduced because they didn t meet modern safety standards 7 Modern systems editA number of ground level power supply systems were developed from the 1970s through the 1990s 8 but were not reliable or safe enough for commercial use 9 The first ground level power supply system developed to modern safety standards was the Ansaldo Stream 7 although a competing system Alstom APS was the first to be commercially implemented in 2003 This success led to a proliferation of commercial implementations of ground level power supply systems 10 During the late 2010s advancements in technology led to ground level power supplies seeing increasing reliability and economic feasibility 11 Electric road systems edit Sweden edit See also Swedish Transport Administration electric road program nbsp Electric truck driving on a public road with Elways Evias ground level power supply near Arlanda airport 2019 Electric roads power and charge electric vehicles while driving Sweden has tested electric road systems that charge the batteries of trucks and electric cars and among the tested systems are two ground level power supply systems tested since 2017 in road rail by Elways Evias and on road rail by Elonroad 12 Elonroad later developed an in road rail system for highway use at speeds up to 130 kilometres per hour 81 mph 13 The systems were found to be more economical than the tested overhead line system and dynamic inductive charging system The in road rail system is planned to deliver up to 800 kW per vehicle traveling over a powered segment of the rail and the system is estimated to be the most cost effective among the four tested systems The new systems are expected to be safe with segments of the rail being powered only when a vehicle is traveling over them 14 The rails have been tested while submerged in salt water and were found to be safe for pedestrians 15 France edit See also Transport in France Electric roads The co director for one of the French Ministry of Ecology working groups on electric road systems stated that rail based ERS are the most advantageous though the specific rail technology has yet to be standardized France plans to invest 30 to 40 billion euro by 2035 in an electric road system spanning 8 800 kilometers Ground level power supply technologies are considered the most likely candidates for electric roads 16 Two projects for assessment of electric road technologies have been announced in 2023 The first French public road with an electric road system is planned to open in 2024 using a ground level power supply system derived from Alstom APS 17 The second with technology developed by Elonroad is scheduled to undergo laboratory testing for skid effects on motorcycles before being deployed along two kilometers on the A10 autoroute south of Paris 13 Standardization edit Alstom Elonroad and other companies have in 2020 begun drafting a standard for ground level power supply electric roads 18 19 The European Commission published in 2021 a request for regulation and standardization of electric road systems 20 Shortly afterward a working group of the French Ministry of Ecology recommended adopting a European electric road standard formulated with Sweden Germany Italy the Netherlands Spain Poland and others 21 The first standard for electrical equipment on board a vehicle powered by a rail electric road system ERS has been published in late 2022 22 The standard CENELEC Technical Standard 50717 specifies the following an ERS voltage of 750 volts a contact shoe capable of withstanding impact of gravel and similar road debris at the maximum operating speed a weak link that breaks off the current collector at the structural fixing points if the force is larger than the maximum specified by the vehicle manufacturer automatic monitoring of the presence of ERS infrastructure automatic engagement and disengagement a presence signal that may be analog or digital and optional standard bidirectional communication ease of inspection and replacement for the wearing parts of the sliding contact and standard tests markings maintenance and operational environment conditions 23 The 50717 standard does not encompass but specifies for normative purposes three architectures for ERS infrastructure Type A architecture with two parallel surface level conductive rails one positive and one negative Type B architecture with a single surface level or raised track with short segments where each two segments in series consist of one positive and one negative segment and Type C architecture with three parallel conductive rails one positive and one negative below surface level in 1 5 cm wide channels and one or more rails earthed at surface level 23 Following standards encompassing full interoperability and a unified and interoperable solution for ground level power supply are scheduled to be published by the end 2024 detailing complete specifications for communication and power supply through conductive rails embedded in the road 24 25 Modern implementations editAnsaldo Stream edit The first modern ground level power supply system to be developed is the Ansaldo Stream system STREAM is an acronym that stands for Sistema di TRasporto Elettrico ad Attrazione Magnetica meaning System of Electric Transport by Magnetic Attraction The system uses a channel in the road made of insulating composite fiberglass material which contains a flexible copper strip a vehicle passing over the channel with a special magnetic contact shoe raises the conductor to the surface allowing power to flow to the vehicle Segments of the strip are powered only when a vehicle passes over them The system was developed in 1994 26 and trialed on a public tram line in 1998 7 which was eventually dismantled in 2012 27 Alstom APS edit nbsp A section of APS track showing the neutral sections at the end of the powered segments plus one of the insulating joint boxes which mechanically and electrically join the APS rail segments Bordeaux Alstom APS uses a third rail placed between the running rails divided electrically into 11 metre segments These segments automatically switch on or off by radio control according to whether a tram is passing over them thereby eradicating any risk to other road users The tram has two collector shoes and two segments of rail are active at any given time to avoid interruption of power when passing between segments APS was developed by Innorail a subsidiary of Spie Enertrans but was sold to Alstom when Spie was acquired by Amec It was originally created for the Bordeaux tramway which was constructed from 2000 and opened in 2003 becoming the first modern commercial ground level power supply system From 2011 the technology has been used in a number of other cities around the world 28 29 The French government reports no electrocutions or electrification accidents on any tramway in France from as early as 2003 30 until as recently as December 31 2020 30 31 Alstom further developed the APS system for use with buses and other vehicles 32 The system has been tested for compatibility with snow plows and for safety under exposure to snow ice salting and saturated brine 33 Alstom will trial its electric road system on a public road in the Rhone Alpes region between 2024 and 2027 17 CAF ACR edit nbsp CAF ACR equipped Urbos 3 tram running through central Seville 2015 The tram is powered by supercapacitors charged by a ground level power supply Construcciones y Auxiliar de Ferrocarriles CAF trialed its Acumulador de Carga Rapida ACR ground level power supply system in 2007 in Seville Sections of the Seville MetroCentro tramway around the Seville Cathedral were converted to the ACR ground level power supply system ACR s first commercial installation was aboard Urbos trams supplied to MetroCentro in 2011 allowing the permanent removal of overhead lines around the cathedral 34 Line 1 of the Tranvia de Zaragoza has also used ACR since its second construction phase was completed in 2013 The use of ACR avoided the installation of overhead lines in the city s historic centre 35 36 ACR was included in the Newcastle Light Rail in Australia and Luxembourg s new tram system 37 38 Ansaldo Tramwave edit Derived from Ansaldo Stream and developed by Italian company Ansaldo STS which later became Hitachi Rail STS the Ansaldo TramWave ground level power supply system successfully entered commercial application in 2017 with the opening of Zhuhai tram Line 1 first phase in China The tram is the first fully low floor tram system adopting ground level power supply technology 39 Later in 2017 Western Suburb Line in Beijing was opened with the same technology from Ansaldo 40 The technology has been licensed to CRRC Dalian and all the technologies were transferred to China 41 References edit a b c John H White Jr Public Transport in Washington before the Great Consolidation of 1902 Records of the Columbia Historical Society Washington D C 66 68 46 216 230 a b Jack W Boorse January 2005 Directly and Indirectly Reducing Visual Impact of Electric Railway Overhead Contact Systems Transportation Research Record 1930 1 doi 10 1177 0361198105193000107 a b c Gerry Colley November 27 2014 Electrifying the streets the surface contact controversy in give English towns 1880 1920 PDF doi 10 21954 ou ro 0000d65c a b Dewi Williams 2004 London Trams current collectors ploughs a b c Eric Schatzberg 2001 Culture and Technology in the City Opposition to Mechanized Street Transportation in Late Nineteenth Century America MIT Press Legat Tibor Zsolt L Nagy Gabor Zsigmond 2010 Bevezeto Introduction Szamos villamos Numbered tram in Hungarian Budapest Joszoveg pp 6 12 ISBN 978 615 5009 15 0 a b c d e J Baggs March 9 2006 5 1 Ground Level Power Supply Wire Free Traction System Technology Review PDF Edinburgh Tram Network John D Swanson 2003 Ground level switched contact systems Light Rail Without Wires A Dream Come True PDF Transportation Research Board Michael P Hennessey January 1994 Evaluation of the E TRAN Vehicle Propulsion Concept PDF Minnesota Department of Transportation pp 11 12 John D Swanson April 7 2019 Continued Advances in Light Rail Streetcar Vehicle Off Wire Technology PDF Transportation Research Board Guerrieri M 2019 Catenary Free Tramway Systems Functional and Cost Benefit Analysis for a Metropolitan Area Urban Rail Transit 5 289 309 doi 10 1007 s40864 019 00118 y D Bateman et al October 8 2018 Electric Road Systems a solution for the future PDF TRL pp 146 149 a b Lena Corot August 30 2023 Vinci teste la recharge par induction et par rail sur autoroute L USINENOUVELLE com Analysera forutsattningar och planera for en utbyggnad av elvagar Swedish Transport Administration February 2 2021 pp 21 23 25 26 54 Daniel Boffey April 12 2018 World s first electrified road for charging vehicles opens in Sweden The Guardian Laurent Miguet April 28 2022 Sur les routes de la mobilite electrique Le Moniteur a b Jean Philippe Pastre June 30 2023 L APS d Alstom bientot teste sur les routes TRM24 PIARC February 17 2021 Electric Road Systems PIARC Online Discussion 34 minutes 34 seconds 2 hours 36 minutes 51 seconds archived from the original on December 22 2021 Martin G H Gustavsson ed March 26 2021 Key Messages on Electric Roads Executive Summary from the CollERS Project PDF CollERS p 6 retrieved February 11 2022 European Commission July 14 2021 Proposal for a REGULATION OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL 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of an in road Electric Road System with winter service operations PDF Alstom PIARC Ameneiro A S 2011 04 05 Adios a las catenarias en la Catedral Diario de Sevilla in Spanish Seville Retrieved July 16 2018 Zaragoza tram Line 1 enters service Railway Gazette International London 2011 04 26 Retrieved 2018 07 16 Crespo Roig Maria 2011 01 20 CAF apuesta por que Zaragoza tenga un metro sin catenarias que funcione con la energia que recargue en las paradas aragondigital es in Spanish Zaragoza Retrieved July 16 2018 Newcastle light rail to be Australia s first wire free system 19 April 2017 Newcastle Light Rail Australia Aurecon 历经磨难 全球首个地面供电的100 低地板现代有轨电车项目终成正果 去颐和园 香山更方便啦 西郊线年底运营 还能和地铁换乘 中国首次引进现代有轨电车技术 图 External links editTechnical Committee 69 Electrical power energy transfer systems for electrically propelled road vehicles and industrial trucks International Electrotechnical Commission nbsp Wikimedia Commons has media related to Ground level power supply Retrieved from https en wikipedia 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