A total of four three-car trains were introduced during fiscal 2011 and 2012, converted from former JR East 205 series EMU cars.

[3] The 6000 series trains operate on the 26.6 km (16.5 mi) Fujikyuko Line in Yamanashi Prefecture, which runs between Ōtsuki and Kawaguchiko, and are normally used on all-stations "Local" services.

Modifications involved transplanting a driving cab onto a former intermediate motored car, the provision of LED destination indicators, and passenger-operated door buttons.

[4] A formal debut event was staged on 18 March 2012, from which date, set 6501 also entered revenue service.

[9] In September 2016, set 6501 received a special red and white livery based on that of the Matterhorn Gotthard Bahn in Switzerland to mark the 25th anniversary of the signing of a sister railway agreement with the line.