 Many SD7s both high and short-hood can still be found in service today on shortline railroads and industrial operators, although most Class 1 roads stopped using these locomotives by the 1970s and 1980s.Some remain in rebuilt form on some major Class I railroads, as switcher locomotives..Many earlier model GPs, most particularly GP40s, GP39s and GP38s, also their SD equivalents, SD40s, SD39s and SD38s have been rebuilt to "Dash 2" standards for another 30 to 40 years of service.