 The class is subdivided into the original EF510-0 sub-class operated by JR Freight and fifteen EF510-500 sub-class locomotives ordered and originally operated on passenger services by JR East.As of 1 October 2013, there were 23 EF510-0 locomotives and 15 EF510-500 locomotives in service.The first locomotive, EF510-1, was delivered in February 2002 and initially based at Shin-Tsurumi Depot before being transferred to Toyama Depot in 2002.