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In page High-speed rail:

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Japanese National Railways (JNR) engineers began to study the development of a high-speed regular mass transit service. In 1955, they were present at the Lille's Electrotechnology Congress in France, and during a 6-month visit, the head engineer of JNR accompanied the deputy director Marcel Tessier at the DETE (SNCF Electric traction study department).[2] JNR engineers returned to Japan with a number of ideas and technologies they would use on their future trains, including alternating current for rail traction, and international standard gauge.[citation needed]