Joyful Train is the name given to railway rolling stock or train sets operated by the JR Group in Japan primarily for charters, special events, tourist excursions, and other similar purposes.

The E655 series (E655系) is an AC/DC dual-voltage electric multiple unit (EMU) train operated by East Japan Railway Company in Japan. The single 5-car trainset is used as a luxury charter train called Nagomi , and also as the Imperial train by inserting a dedicated Imperial carriage.