Making use of a streamlined Raymond Lowey body design, this GG-1 class, 2-C+C-2 electric locomotive has 7,500 HP and a top speed of 100 mph. It was used in both passenger and freight service in the Northeast Corridor until 1986, renumbered as Amtrak #4916. The GG1 was 79 feet 6 inches (24.23 m) long and weighed 475,000 pounds.The locomotive's frame was in two halves joined with a ball and socket joint, allowing the locomotive to negotiate sharper curves. The body rested on the frame and was clad in welded steel plates. The control cabs were near the center of the locomotive on each side of the main oil-cooled transformer and oil-fired train-heating boiler. This arrangement provided for greater crew safety in a collision and provided for bi-directional operation of the locomotive. Using Whyte notation for steam locomotives, each frame is a 4-6-0 locomotive, which in the Pennsylvania Railroad classification system is a "G". The GG1 has two such frames back to back, 4-6-0+0-6-4. The related AAR wheel arrangement classification is 2-C+C-2. This means one frame mounted upon a set of two axles unpowered (the "2") and three axles powered (the "C") hinged with the ball and socket to another frame of the same design (the +). The unpowered "2" axles are at either end of the locomotive.