Nagano Shinkansen
One F set, F17, was specially modified at Sendai Depot between August 1997 and January 1998 for use on additional Nagano Shinkansen "Asama" services in February 1998 during the 1998 Winter Olympics held in Nagano. The train was renumbered F80, and modifications included ability to operate on both 25 kV AC 50 Hz and 60 Hz overhead power supplies, weight-saving measures to comply with the 16 tonne axle load restriction, and additional control equipment to cope with the 30‰ gradient of the Nagano Shinkansen. Maximum speed was limited to 210 km/h when operating on the Nagano Shinkansen.