structural:reformatting, quality:corruption
Tōhoku Shinkansen

E5 series trains, capable of up to 320 km/h (200 mph), initially limited to 300 km/h (186 mph), were introduced on the Tōhoku Shinkansen in March 2011. Operation at the maximum speed of 320 km/h (200 mph) between Utsunomiya and Morioka on this route commenced on 16 March 2013. It reduced the journey time to around 3 hours for trains from Tokyo to Shin-Aomori, a distance of 674 km (419 mi).

Extensive trials using the Fastech 360 test trains have shown that operation at 360 km/h (224 mph) is not currently feasible because of problems of noise pollution (particularly tunnel boom), overhead wire wear, and braking distances. On 30 October 2012, JR East announced that it was pursuing research and development to increase speeds to 360 km/h (224 mph) on the Tohoku Shinkansen by 2020. The ALFA-X is currently undergoing testing.