"300X" was the name given to the Class 955 (955形) 6-car experimental Shinkansen train developed in 1994 by the Central Japan Railway Company in Japan to test technology to be incorporated in future shinkansen trains operating at speeds of 300 km/h (186 mph) or higher.
Preserved car 955-6 at Hamamatsu Works, July 2010
Closeup view of rubber diaphragm between cars, September 2000
"300X" trainset on a daytime test run at Maibara Station, July 1999
443.0 km/h speed record sticker on car 955-6
"STAR21" was the name given to the Class 952/953 (952・953形) 9-car experimental Shinkansen train developed in 1992 by the East Japan Railway Company in Japan to test technology to be incorporated in next-generation shinkansen trains operating at speeds of 350 km/h (217 mph) or higher. The name was an acronym for "Superior Train for the Advanced Railway toward the 21st Century".
Image: STAR21 952 1 Maibara 20060727
Image: JRE 953 5 953 1
Sticker on the side of 953-5 commemorating the national railway speed record of 425.0 km/h(lower:Receive the Heisei7(1995) IEEJ Electrical Science Promotion Award(Progress Award).)
Car 952-1 preserved at Maibara, July 2006