Newest but slowest Shinkansen passing at 209km/h

While it is quite fast, at a top speed of 260km/h, the NishiKyushu Shinkansen, among all the newer Shinkansen, are the slowest Shinkansen (High-Speed Rail in Japan). This is due to the greatest enemy of Shinkansen speeds being noise pollution. And newer Shinkansen built after 1987 uses a different scheme ("Seibi Shinkansen") which only requires funding for soundproofing up to 260km/h, and the operator doesn't own the tracks. While all the older Shinkansen Lines are owned by operators, so they can be easily upgraded, they have a top speed of between 275km/h to 320km/h.
List of Shinkansen speeds:
-Newer:
260km/h Kyushu Shinkansen
260km/h NishiKyushu Shinkansen (~half built, another half planned)
260km/h Hokuriku Shinkansen (some in construction, some planned)
260km/h Tohoku Shinkansen Morioka-Shin Aomori (being upgraded to 320km/h in 2026)
260km/h Hokkaido Shinkansen Shin Aomori-Shin Hakodate Hokuto
(320km/h Hokkaido Shinkansen Shin Hakodate Hokuto, in construction, upgraded from 260km/h in construction, an extra soundproofing cost funded by operator JR Hokkaido)
(500km/h Chuo Shinkansen, in construction, some completed for testing and achieved 603km/h fastest train in existance, linear Maglev, funded entirely by the operator JR Central, so not under "Seibi Shinkansen" scheme)
-Older:
300km/h Sanyo Shinkansen 5km East of Himeji-Hakata
285km/h Sanyo Shinkansen Shin Osaka-5km East of Himeji
285km/h Tokaido Shinkansen (world’s first commercial high speed rail, connects Tokyo to Nagoya and Osaka, insane frequency of 16 trains/hour, tight curves of radius=2500m)
275km/h Joetsu Shinkansen (recently upgraded, 240km/h before 18 of March 2023)
275km/h Tohoku Shinkansen Omiya-Utunomiya
320km/h Tohoku Shinkansen Utunomiya-Morioka
-Exceptions:
120km/h Hakata-Hakata Minami: trans traveling between Hakata terminal and the Hakata Shinkansen Depot may carry passengers and tickets are sold like standard train tickets.
Shinkansen run at slow speeds in central Tokyo, which includes:
110km/h Tokaido Shinkansen, Tokyo-Shinagawa
110km/h Tohoku Shinkansen, Tokyo-Ueno
130km/h Tohoku Shinkansen, Ueno-Omiya
110km/h Echigo Yuzawa-Gala Yuzawa
Legally not Shinkansen, but built as a part of Joetsu Shinkansen and connects passenger directly to a skiing resort.
“mini Shinkansen”, legally they are not Shinkansen, just specially made Shinkansen trains that runs on modified standard train tracks:
130km/h Yamagata Shinkansen
130km/h Akita Shinkansen