{"id":181224,"date":"2025-11-01T12:22:39","date_gmt":"2025-11-01T12:22:39","guid":{"rendered":"https:\/\/teknomers.com\/en\/the-japanese-shinkansen-was-once-the-fastest-train-in-the-world-until-china-surpassed-it-the-reason-for-this-is-the-piston-effect\/"},"modified":"2025-11-01T12:22:40","modified_gmt":"2025-11-01T12:22:40","slug":"the-japanese-shinkansen-was-once-the-fastest-train-in-the-world-until-china-surpassed-it-the-reason-for-this-is-the-piston-effect","status":"publish","type":"post","link":"https:\/\/teknomers.com\/en\/the-japanese-shinkansen-was-once-the-fastest-train-in-the-world-until-china-surpassed-it-the-reason-for-this-is-the-piston-effect\/","title":{"rendered":"The Japanese Shinkansen was once the fastest train in the world until China surpassed it. The reason for this is the “piston effect.”"},"content":{"rendered":"\n

The \u00a0piston\u00a0 in a four-stroke engine<\/a> plays a pivotal role in compressing air, facilitating fuel combustion, and propelling exhaust out of the combustion chamber. In essence, it is responsible for \u00a0moving air\u00a0 either up or down. <\/p>\n

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Now, envision a train racing into a tunnel at over \u00a0300 km\/h\u00a0. As it transitions into the tunnel, it compresses the air within, pushing it toward the tunnel’s far end. This action is comparable to that of a piston. The \u00a0train\u00a0 moves linearly, while the tunnel acts like a combustion chamber. <\/p>\n

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At first glance, this might not seem problematic. The air appears to flow seamlessly towards the exit, posing little concern, especially if the high-speed rail lines stretch across a \u00a0100-kilometer\u00a0 bridge. <\/p>\n

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However, if you’re located in a \u00a0mountainous country\u00a0 that relies heavily on trains to transport millions swiftly across long distances, the situation becomes critical. The \u00a0piston effect\u00a0 is a fundamental aspect of physics, and addressing it to increase speed is a complex challenge. <\/p>\n

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A Historical Overview of High-Speed Trains<\/h2>\n

In 1964, while Spain was gradually opening its borders, \u00a0Abebe Bikila\u00a0 achieved his second Olympic Marathon win in Tokyo, dramatically sporting Puma Osaka shoes \u2014 quite a leap from his barefoot victory in Rome. Was he among those who first boarded the \u00a0Shinkansen\u00a0? That same year marked its debut, revolutionizing rail with trains reaching speeds of \u00a0210 km\/h\u00a0, establishing the world’s first high-speed rail line. <\/p>\n

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Fast forward over six decades, and Japan has lost its title as the leader in high-speed rail. China now dominates, driven by its expansive territory. Spain has also surpassed Japan in high-speed rail mileage. This disparity largely comes from China’s aggressive investment in advancements, including the cutting-edge \u00a0maglev trains\u00a0 that can reach a breathtaking \u00a0896 km\/h\u00a0. <\/p>\n

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\n \"Millions\n <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n

China\u2019s financial resources empower them to construct the \u00a0longest bridges\u00a0 globally, effectively tackling geographical barriers. Conversely, Japan confronts mountainous terrains, relying on \u00a0tunnels\u00a0, which complicates the pursuit of high-speed travel. <\/p>\n

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Upon entering a tunnel, the \u00a0piston effect\u00a0 kicks in, preventing further speed increases. This phenomenon manifests in loud explosions, equipment failures, and discomfort for passengers. As trains thunder into tunnels, air compression occurs, creating pressure changes that can be devastating to the human ear. When exiting, shock waves and sound explosions, known as \u00a0tunnel booms\u00a0, can be heard from over \u00a0400 meters\u00a0 away. <\/p>\n

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\n \"Japan\n <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n

Japan is now wrestling with a legacy problem. While their trains are wider than European ones, their tunnels are narrower, a decision made to reduce infrastructure costs and minimize landslide risks. Initially, this setup didn’t pose issues, but with increasing train speeds, the limitations became glaringly evident. <\/p>\n

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In contrast, China has opted for wider tunnels, significantly reducing the \u00a0void effect\u00a0 when trains enter, resulting in a smoother experience for passengers. This design also improves efficiency by lowering resistance and conserving energy. <\/p>\n

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For Japan, the solution is far from straightforward. Approximately \u00a013%\u00a0 of the Tokaido Shinkansen runs through tunnels, while the Sanyo Shinkansen and the under-construction Hokkaido Shinkansen spend even more time underground. <\/p>\n

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One effective strategy has been designing trains with elongated, aerodynamic noses, mimicking the beak of a kingfisher, which plunges into water with minimal splash. By enhancing aerodynamics, the pressure wave generated during tunnel entry is mitigated. <\/p>\n

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Additionally, Japan is exploring options to widen tunnel entrances and implement side openings for air escape. This release alleviates pressure waves and enhances passenger comfort while facilitating higher speeds. Some plans even include developing \u00a0hermetic trains\u00a0 with controlled interior pressure. <\/p>\n

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As testing continues, Japan aims for trains capable of reaching speeds of \u00a0400 km\/h\u00a0. However, their inherited infrastructure poses significant hurdles in competing with China. <\/p>\n

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Photo Credit: Rikku Sama<\/a><\/p>\n

In a competitive world of high-speed rail, \u00a0innovation\u00a0 and \u00a0adaptability\u00a0 will determine which country leads the charge in the years to come. Japan is keenly aware of the challenges but continues to strive for advancement to remain relevant in the high-speed rail landscape.<\/p>\n


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General News – 2<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The \u00a0piston\u00a0 in a four-stroke engine plays a pivotal role in compressing air, facilitating fuel combustion, and propelling exhaust out of the combustion chamber. In essence, it is responsible for \u00a0moving air\u00a0 either up or down. Now, envision a train racing into a tunnel at over \u00a0300 km\/h\u00a0. As it transitions into the tunnel, it […]<\/p>\n","protected":false},"author":1,"featured_media":181225,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36399],"tags":[2397,2093,2661,4108,44548,5087,44547,37118,1812,110],"class_list":["post-181224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","tag-china","tag-effect","tag-fastest","tag-japanese","tag-piston","tag-reason","tag-shinkansen","tag-surpassed","tag-train","tag-world"],"_links":{"self":[{"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/posts\/181224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/comments?post=181224"}],"version-history":[{"count":0,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/posts\/181224\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/media\/181225"}],"wp:attachment":[{"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/media?parent=181224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/categories?post=181224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/teknomers.com\/en\/wp-json\/wp\/v2\/tags?post=181224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}