 The first full-production locomotive, EF510-2, was delivered in November 2003, and this and subsequent locomotives delivered featured "Red Thunder" bodyside branding.The EF510-500 subclass consists of 15 locomotives originally operated by East Japan Railway Company (JR East), which replaced its fleet of EF81 locomotives formerly used to haul "Cassiopeia" and "Hokutosei" overnight sleeping car trains from June 2010.These were the first locomotives to be ordered by any of the JR passenger operating companies since privatization.