The Pennsylvania Railroad GG1 was a class of electric locomotives built for the Pennsylvania Railroad (PRR), in the northeastern United States. Between 1934 and 1943 General Electric and the PRR's Altoona Works built 139 GG1s. The GG1 entered service with the PRR in 1935 and later ran on successor railroads Penn Central, Conrail and Amtrak. The last GG1 was retired by New Jersey Transit in 1983. Most have been scrapped, but sixteen are in museums