The Chuo Shinkansen (中央新幹線, Central Shinkansen) is a Japanese maglev line under construction between Tokyo and Nagoya, with plans for extension to Osaka. Its initial section is between Shinagawa Station in Tokyo and Nagoya Station in Nagoya, with stations in Sagamihara, Kōfu, Iida and Nakatsugawa. Following the completion of the Tokyo–Nagoya line, the line will extend to stations in Mie, Nara and Osaka. The line is expected to connect Tokyo and Nagoya in 40 minutes, and eventually Tokyo and Osaka in 67 minutes, running at a maximum speed of 505 km/h (314 mph). About 90% of the 286-kilometer (178 mi) line to Nagoya will be tunnels.
The Chuo Shinkansen is the culmination of Japanese maglev development since the 1970s, a government-funded project initiated by Japan Airlines and the former Japanese National Railways (JNR). Central Japan Railway Company (JR Central) now operates the facilities and research. The line is intended to extend and incorporate the existing Yamanashi test track (see below). The trainsets are popularly known in Japan as linear motor car (リニアモーターカー, rinia mōtā kā), though there are many technical variations.
Government permission to proceed with construction was granted on 27 May 2011. Construction is expected to cost over ¥9 trillion (approximately 82 billion USD) and commenced in 2014.
The start date of commercial service is unknown, after Shizuoka Prefecture denied permission for construction work on a portion of the route in June 2020.[1] JR Central originally aimed to begin commercial service between Tokyo and Nagoya in 2027. However, in 2024, Central Japan Railway Co President Shunsuke Niwa said that due to construction delays a 2027 opening was now impossible and it is not expected to open until at least 2034.[3] The Nagoya–Osaka section was planned to be completed as late as 2045, but the date was moved to as early as 2037 following a loan from the Japanese government.[4]
Development overview
A maglev train on the Yamanashi Test Track, November 2005
Yamanashi Test Track viaduct under construction in the city of Fuefuki in the Kofu Basin, July 2011
Following the opening of the Tokaido Shinkansen between Tokyo and Osaka in 1964, Japanese National Railways (JNR) focused on the development of faster Maglev technology. In the 1970s, a 7-kilometer (4.3 mi) test track for Maglev research and development was built in Miyazaki Prefecture.[5] As desired results had been obtained at the (now former) Miyazaki test track, an 18.4-kilometer (11.4 mi) test track with tunnels, bridges and slopes was built at a site in Yamanashi Prefecture, between Ōtsuki and Tsuru (35°34′58″N138°55′37″E / 35.5827°N 138.927°E / 35.5827; 138.927 (Yamanashi Test Track)). Residents of Yamanashi Prefecture and government officials were eligible for free rides on the Yamanashi test track, and over 200,000 people took part. Trains on this test track routinely achieved operating speeds of over 500 km/h (311 mph), allowing for a thorough test of the capabilities of the future Chuo Shinkansen.
The track was extended a further 25 km (15.5 mi) along the future route of the Chuo Shinkansen, to bring the combined track length up to 42.8 km (26.6 mi). Extension and upgrading work was completed by June 2013, allowing researchers to run tests at top speed over longer periods.[6][7]
The first tests on this longer track took place in August 2013.[8][9]
JR Central began offering public train rides at 500 km/h (311 mph) on the Yamanashi test track, via a lottery selection, in 2014.[10] The train holds the world record for the fastest manned train on this track.
Routing
The line's route passes through many sparsely populated areas in the Japanese Alps (Akaishi Mountains), but is more direct than the current Tōkaidō Shinkansen route, and time saved through a more direct route was a more important criterion to JR Central than having stations at intermediate population centers. Also, the more heavily populated Tōkaidō route is congested, and providing an alternative route if the Tōkaidō Shinkansen were to become blocked by earthquake damage was also a consideration. The route will have a minimum curve radius of 8,000 m (26,000 ft), and a maximum gradient of 4%. This is more than the traditional Shinkansen lines, which top out at 3%.
The planned route between Nagoya and Osaka includes a stop in Nara. In 2012, politicians and business leaders in Kyoto petitioned the central government and JR Central to change the route to pass through their city.[11] The governor of Nara Prefecture announced in November 2013 that he had re-confirmed the Transport Ministry's intention to route the segment through Nara.[12]
JR Central announced in July 2008 that the Chūō Shinkansen would start at Tokyo's Shinagawa Station, citing difficulties in securing land at nearby Tokyo and Shinjuku stations for a maglev terminal.[13]
Summary of the plans considered (Plan C was chosen)
A JR Central report on the Chuo Shinkansen was approved by a Liberal Democratic Party panel in October 2008, which certified three proposed routes for the Maglev. According to a Japan Times news article, JR Central supported the more direct route, which would cost less money to build than the other two proposals, backed by Nagano Prefecture. The latter two plans had the line swinging up north between Kōfu and Nakatsugawa stations to serve areas within Nagano.[14] In June 2009, JR Central also announced research results comparing the three routes, estimating revenue and travel time, which showed the most favorable being the shortest Plan C, with long tunnels under the Japanese Alps.[15] The Council for Transport Policy for the Ministry of Land, Infrastructure, Transport and Tourism concluded on 20 October 2010 that Plan C would be most cost-efficient.[16] JR Central announced that one station would be constructed in each of Yamanashi, Gifu, Nagano, and Kanagawa Prefectures.[17]
On 31 October 2014, Japan's Ministry of Land, Infrastructure, Transport and Tourism approved Plan C for construction.[18] Construction began on 17 December 2014.[19]
Preparatory work at Nagoya station began in 2016.[20]
A skyscraper measuring 220 m (720 ft) in height was built by JR Central. The structure is named 名古屋駅新ビル ("Nagoya-eki Shin-biru", Nagoya Station new building) and accommodates a station for the maglev trains in its basement area.[21]
Construction schedule and costs
Construction of Chūō Shinkansen Jinryō Exit, in 2019Construction work at Nagoya Station in 2019
JR Central announced in December 2007 that it planned to raise funds for the construction of the Chuo Shinkansen on its own, without government financing. Total cost, originally estimated at 5.1 trillion yen in 2007,[22] escalated to over 9 trillion yen by 2011.[23] Nevertheless, the company has said it can make a pre-tax profit of around 70 billion yen in 2026, when the operating costs stabilize.[24] The primary reason for the project's huge expense is that most of the line is planned to run in tunnels (about 86% of the initial section from Tokyo to Nagoya will be underground)[25] with some sections at a depth of 40 m (130 ft) (deep underground) for a total of 100 km (62 mi) in the Tokyo, Nagoya and Osaka areas.[citation needed]
The original construction schedule from 2013, which called for the Tokyo–Nagoya segment to open in 2027 and the Nagoya–Osaka segment to open in 2045, was designed to keep JR Central's total debt burden below its approximate level at the time of privatization (around 5 trillion yen).[26] The schedule was later altered to bring forward the completion date of the Nagoya-Osaka segment to 2037, after JR Central received a loan from the Japanese government.[4]
The first major contract announced was for a 7 km (4.3 mi) tunnel in Yamanashi and Shizuoka prefectures expected to be completed in 2025.[27] Construction of a 25 km (16 mi) tunnel under the southern Japanese Alps commenced on 20 December 2015, approximately 1,400 m (4,600 ft) below the surface at its deepest point. The tunnel is expected to be completed in 2025, and upon completion will succeed the 1,300 m (4,300 ft) deep Daishimizu Tunnel on the Joetsu Shinkansen line as the deepest tunnel in Japan. Construction has also started on the maglev station at Shinagawa.[28] Being built below the existing Shinkansen station, and to consist of two platforms and four tracks, construction is planned to take 10 years, largely to avoid disruption to the existing Tokaido Shinkansen services located above the new station.
JR Central estimates that Chuo Shinkansen fares will be only slightly more expensive than Tokaido Shinkansen fares, with a difference of around 700 yen between Tokyo and Nagoya, and around 1,000 yen between Tokyo and Osaka. The positive economic impact of the Chuo Shinkansen in reducing travel times between the cities has been estimated at anywhere between 5 and 17 trillion yen during the line's first fifty years of operation.[29]
Shizuoka Prefecture dispute
Ōi River
Construction is yet to commence on the part of the line going through Shizuoka Prefecture, as the municipality has expressed concern about water from the Ōi River leaking into the tunnel, lowering the water level.[30] JR Central expressed concern early on that the delay in construction of the only 9 kilometer long section going through Shizuoka might throw the entire project off schedule.[31]
It is believed by some political analysts that the actual reason for Shizuoka Prefecture's apparent concerns of the project is not over the Ōi River, but was merely used as a pretense to force JR Central's hand in building a train station on the Tokaido Shinkansen under Shizuoka Airport.[32] Shizuoka Prefecture, being the only prefecture where no new station will be built, has long lobbied JR Central for years for the construction of such a station, with the line running directly under the airport. JR Central has so far refused, citing the close distance to the neighboring Kakegawa Station and Shizuoka stations. If constructed, travel time from the center of Tokyo to the airport would be comparable to that for Tokyo Narita Airport, enabling it to act as a third hub airport for the capital.[33] As the station would be built underneath an active airport, it is expected to open after the new maglev line.[34]
Officials of Shizuoka Prefecture, in a meeting with JR Central in June 2020, denied permission to begin construction work on the tunnel. JR Central announced the following week that it would be "difficult" to open the Tokyo-Nagoya line in 2027 as previously announced.[1] The incumbent governor of Shizuoka Prefecture Heita Kawakatsu was re-elected in June 2021, partly on a platform of continued opposition to construction of the new line, barring further accommodations by JR Central.[35]
Following a series of meetings between JR Central and Shizuoka Prefecture facilitated by the Ministry of Transportation, an interim report was released on the results of the meetings so far in late December 2021. Among other things, the report confirmed that while JR was committed to returning any water leaking into the tunnel once construction was completed, there is no known feasible way to return all of the water during the construction phase. However, it did also conclude that the amount of water leaked was likely to be insignificant.[36]
On 7 January 2022, commenting on the report, the Shizuoka Prefecture governor expressed continued opposition to construction when it could result in water levels going down, even if only during construction. He urged JR Central to re-investigate the possibility of returning leaking water during construction.[37] On 20 January that same year, the prefecture officially called the report "insufficient", and announced that it still would not allow construction to commence.[38]
On 21 December 2023, during a routine press conference, JR Central’s President Niwa announced an agreement with Tokyo Electric Power Company, the Ōi River's dam operator, to diminish the volume of water extracted from the upstream dam. This action aims to address the anticipated impact on the Oi River’s water levels, a consequence of the construction project. The agreement outlines the method of reducing water intake and the concept of compensation. The proposal was well-received and endorsed previously by the local governing council in November 2023.[citation needed]
On 2 April 2024, Governor Kawakatsu announced that he would be resigning after making statements criticised as being insulting towards certain professions.[39] This came less than a week after JR Central's announcement that it would be unable to meet its goal of opening the Shinagawa-Nagoya section of the line by 2027. Governor Kawakatsu's resignation was met with discussions about whether his successor would approve tunnel construction, triggering a slight rise in JR Central’s stock price.[40]
On May 26, 2024, the ensuing by-election was won by Yasutomo Suzuki, who was called a "Maglev Proponent" by Nikkei Asia.[41] The mayor of Nagoya, a city on the maglev, also said "Mr. Suzuki has a deep understanding of industry, so I think he will get the project done quickly."[42] Since the election, preliminary work has been approved and is apparently been proceeding well as of October 2024. [43]
Osaka extension
The government of Osaka Prefecture, as well as local corporations such as Suntory and Nippon Life, have raised concerns about the impact of the delayed construction of the Nagoya–Osaka segment on the Osaka economy. Politicians from the Kansai region called for, and received, state-backed loans for JR Central in order to expedite the line's construction, resulting in the opening of the extension being moved forward by up to 8 years.[12]
Construction accidents
On 27 October 2021, two construction workers died when part of the retaining wall of a temporary work tunnel collapsed. JR Central concluded that the safety checks carried out were insufficient, and vowed to make it clearer to workers which areas had and had not completed the safety checks necessary to allow for the presence of human workers going forward.[44]
The line will run between Tokyo and Nagoya, with plans for an extension to Osaka. Its initial section is between Shinagawa Station in Tokyo and Nagoya Station in Nagoya, with stations in Sagamihara, Kōfu, Iida, and Nakatsugawa.[45]
The line has one station for each prefecture it passes through, except for Shizuoka. The line is expected to connect Tokyo and Nagoya in 40 minutes, and eventually Tokyo and Osaka in 67 minutes, running at a maximum speed of 500 km/h (311 mph).[17]
About 90% of the 286-kilometer (178 mi) line to Nagoya will be in tunnels,[46] with a minimum curve radius of 8,000 m (26,000 ft) and a maximum grade of 4% (1 in 25).
The superconducting coils use Niobium–titanium alloy cooled to a temperature of −269 °C (4.15 K; −452 °F) with liquid helium.[48] Magnetic coils are used both for levitation and propulsion. The trains are accelerated by alternating currents on the ground producing attraction and repulsion forces with the coils on the train. The levitation and guidance system, working with the same principle, ensures that the train is elevated and centered in the track.[48]
Energy consumption
In 2018, a scientific comparison of the energy consumption of SCMaglev, Transrapid and conventional high-speed trains was conducted. The energy consumption per square meter of usable area was examined in relation to speed.[49] The results show that there are only minor differences at speeds of 200 km/h and above. However, maglevs can reach much higher speeds than conventional trains. Conventional trains, on the other hand, require less energy at slow speeds, with this advantage shrinking or even slightly reversing during high-speed operation. As the Chūō Shinkansen mostly runs in tunnels, air resistance will be much higher than for most high-speed railways, significantly increasing energy consumption.[49]
During normal operating conditions, the energy consumption of the L0 series between Tokyo and Osaka is estimated at 90-100 Wh/seat-km. For comparison, the conventional N700-series train operating on the fastest service-pattern on the existing line between Tokyo and Osaka has an estimated energy consumption of 70 Wh/seat-km.[49]
Despite this increase, the L0 series still consumes much less energy than even the most efficient short/medium-haul modern passenger aircraft. For instance, the Airbus A319neo uses ~209 Wh/seat-km over a distance of 1,900 km. This figure would presumably be even higher for very short flights such as Tokyo-Nagoya, with much less time spent cruising.[50]
Moreover, the operation of the L0 series maglev train is completely electric, making it easier to transition to low-carbon energy sources.
Rolling stock
Improved L0 Series maglev train in August 2020
On 2 December 2003, MLX01, a three-car train set a world record speed of 581 km/h (361 mph) in a manned run. On 16 November 2004, it also set a world record for two trains passing each other at a combined speed of 1,026 km/h (638 mph).
On 26 October 2010, JR Central announced a new train type, the L0 Series, for commercial operation at 505 km/h (314 mph).[51] It set a world record speed for a manned train of 603 km/h (375 mph) on 21 April 2015.[52]
On 26 March 2020, the Improved L0 Series started operations on the test track. It represents the completion of 80–90% of the design goals for the final train, and is the first to draw power from the track. Previous models used on-board gas generators.
^Taniguchi, Mamoru (1993). "The Japanese Magnetic Levitation Trains". Built Environment. 9 (3/4). Alexandrine Press: 235. JSTOR23288579. – via JSTOR(subscription required)
^７月中にも最高時速５００キロに 新型車両「Ｌ０系」 [New L0 series trains to reach 500 km/h during July]. Chunichi Web (in Japanese). Japan: The Chunichi Shimbun. 24 July 2013. Archived from the original on 29 July 2013. Retrieved 30 July 2013.
^Ogawa, Hiroo (21 March 2018). "JR新幹線、「静岡空港駅」設置が現実味…「首都圏第3空港」構想" [JR Shinkansen, "Shizuoka Airport Station" installation is realistic ... "Metropolitan area third airport" concept]. ビジネスジャーナル/Business Journal | ビジネスの本音に迫る (in Japanese). Archived from the original on 19 March 2022. Retrieved 22 September 2019.
^Osaka, Naoki (8 July 2019). "リニアでJR東海と対立､静岡県の｢本当の狙い｣ | 新幹線" [Linear confrontation with JR Central, "real aim" of Shizuoka Prefecture]. 東洋経済オンライン (in Japanese). Archived from the original on 19 March 2022. Retrieved 17 July 2022.
^Smith, Kevin (18 December 2014). "JR Central starts construction on Chuo maglev". International Railway Journal. Retrieved 2 January 2015. Major construction on the 286km line, 90% of which will be underground or through tunnels, is set to begin in 2015 and the project is due to be completed in 2027.
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