The Class EF81 is a six-axle Bo-Bo-Bo wheel arrangement multi-voltage AC/DC electric locomotive type operated on passenger and freight services in Japan since 1968.

[3] Four locomotives were built between 1973 and 1975 by Hitachi with unpainted corrugated stainless steel bodies for use on services through the undersea Kanmon Tunnel to Kyushu.

[1] As of 1 April 2016[update], only one Class EF81-300 locomotive remained in service, EF81 303, operated by JR Freight and based at Moji Depot.

[5] As of 1 April 2016[update], three Class EF81-400 locomotives remained in service, EF81 403/404/406, all operated by JR Freight and based at Moji Depot.

[4] As of 1 April 2016[update], 14 Class EF81-600 locomotives remained in service, operated by JR Freight and based at Moji and Toyama Depots.