年表
- 1958Kodama debuts as a limited express on the Tōkaidō Main Line on 1 November 1958, using 151 series trainsets — the first JNR electric-multiple-unit service classified as a limited express. It runs Tokyo–Osaka in 6 hours 50 minutes, enabling a same-day round trip, hence the name 'echo.'
- 1959On 31 July 1959 a 151 series Kodama trainset establishes a narrow-gauge rail world speed record of 163 km/h.
- 1964The conventional Kodama runs until 30 September 1964; the next day, 1 October 1964, the Shinkansen Kodama begins between Tokyo and Shin-Ōsaka (covering the section in five hours, all seats reserved).
- 1972Kodama's range expands westward with the San'yō Shinkansen: the line opens to Okayama on 15 March 1972 (Kodama serving every station on it) and is extended to Hakata in 1975.
- 2003From the 1 October 2003 timetable revision the Tōkaidō Shinkansen Kodama's maximum speed is raised to 270 km/h, cutting the standard Tokyo–Shin-Ōsaka time by 10 minutes to four hours.
- 2008In December 2008 (1 December 2008) reconfigured eight-car 500 series sets enter San'yō Shinkansen Kodama service, replacing the withdrawn 0 series.
- 2012From the 17 March 2012 revision the remaining 100 series K sets are withdrawn from Kodama services, eight-car 700 series E sets become entirely non-smoking, and on-board trolley/sales service is discontinued.
- 2024Following a joint 17 October 2023 announcement by JR Central, JR West and JR Kyushu, on-board smoking rooms on the Tōkaidō, San'yō and Kyūshū Shinkansen are abolished, taking effect on 16 March 2024.
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