Nagano Shinkansen
As with the Nagano Shinkansen N units, these sets are also compatible with both 50 Hz and 60 Hz (25 kV) power supplies, and were also used on Nagano Shinkansen "Asama" services before they were lengthened to ten cars. A further four J sets were delivered in October/November 1998 to augment the fleet to coincide with the introduction E2 series stock on four return "Asahi" services between Tokyo and Niigata on the Jōetsu Shinkansen from the start of the revised timetable in December 1998. From September 2002, the fleet of J sets (except J1) was augmented from 8 to 10 cars with the addition of newly built intermediate cars for use on "Hayate" services to Hachinohe commencing in December 2002. The red stripe on these lengthened sets was also changed to magenta, and the original "wind" bodyside logo was changed to the new "Hayate" logo.