"WIN350" was the name given to the 500-900 series (500系900番台) 6-car experimental high-speed Shinkansen train developed in 1992 by the West Japan Railway Company (JR West) in Japan to test technology to be incorporated in next-generation shinkansen trains expected to operate at speeds of 350 km/h (217 mph) from 1994.

[4] The front-end designs of the two driving vehicles (500-901 and 500-906) were slightly different, with 500-906 featuring a "cockpit" style arrangement.

[2] The WIN350 trainset was withdrawn on 31 May 1996, and a special farewell ceremony was held at Hakata Shinkansen Depot.

[2][3] End car 500-901 is preserved outdoors at the RTRI large-scale wind tunnel test facility in Maibara, Shiga.

Initially expected to be moved to the Modern Transportation Museum in Osaka,[3] end car 500-906 was stored at Hakata Shinkansen Depot[7] until being scrapped in May 2024.