Disposition Pennsylvania Railroad class GG1

amtrak 904 westbound @ harrison, new jersey in june 1975

in 1968 prr 119 surviving gg1s merged new york central railroad form penn central. after creation in 1971, amtrak purchased 30 $50,000 each, , leased 21, of 11 use on new york , long branch commuter trains. amtrak renumbered purchased gg1s #900–929 solid block, later renumbered prefix 4 . leased units conflicting numbers renumbered 4930–4939, except 4935 kept old prr/pc number.

amtrak attempted replace gg1s in 1975 general electric e60, not success: 102-mile-per-hour (164 km/h) derailment during testing had investigated (the e60 used same trucks p30ch diesel in service amtrak), delayed acceptance, , hoped-for 120 miles per hour (193 km/h) service speed never achieved (timetable limit 90 mph, 80, 90).

it not until amtrak imported 2 lightweight european locomotives – x995, rc4a built asea of sweden , x996, french design – replacement found. asea design, nicknamed swedish swifty , or mighty mouse -- , later referred swedish meatball -- winning design. electro-motive diesel, part of general motors, licensed build , became basis of aem-7. aem-7s on hand, amtrak replaced gg1s. gg1 service on amtrak ended on april 26, 1980.

penn central went bankrupt in 1970 , freight operations later assumed government-controlled conrail, used 68 gg1s in freight service until end of electric traction in 1980.

the last gg1s in use of 13 assigned new jersey transit (#4872–4884) north jersey coast line between new york , south amboy (the former new york , long branch) ran until october 29, 1983.