Fastech 360 is the name given to a pair of former experimental high-speed EMU trainsets developed by East Japan Railway Company to test technology for the next-generation Shinkansen rolling stock. The name is a portmanteau of Fast, Technology, and 360 km/h, the target operational speed for production trains based on the new technologies. Speeds of up to 405 km/h (250 mph) were targeted during performance testing. Results of testing using these trains was incorporated into the E5 series and E6 series trains, entering revenue service from 2011, eventually operating at 320 km/h (200 mph).