The AEM-7's were a Swedish design and used some Swedish parts, but were built in the USA by the Electro-Motive Division of General Motors. The "A" of "AEM" is for Swedish electrical manufacturer ASEA, and the "EM" is for Electro-Motive.
Aloha
I thank you and Alan for correcting me about the manufacture and speed of the AEM7
By every objective measure the AEM-7 is a huge improvement over the GG-1. They are faster, much more powerful, and less than half the weight.
Does the AEM7 develop 6000 continuous and 9000 peak hp. that is the rating for the G? What I do like about the AEM7 is they are dependable motors moving lots of people on rails,
Mahalo
The GG-1 had a continuous rating of 4620hp and a short-term maximum rating of 8500hp at about 65mph. The AEM-7 continous rating is about 5000hp with a short-term maximum rating of 7000hp. Those numbers are somewhat higher with the 20 or so AC traction rebuilds.
The demise of the GG-1 can be attribited to many factors, but it all comes down to age and outdated design. The PCB issue, in and of itself, could have been remediated. But the units were already 40 years old and were literally falling apart. The issues, in no particular order, were:
- The PCB-laden transformers
- Increasing serious cracking of the frames and body
- Inability to be converted to permit multiple voltage and frequency supply power
- Inadequate speed to permit use as a replacement for the Budd Metroliner EMU's
- Designed for steam heat passenger cars
The GE E60 was originally to be the replacement for the GG-1, but that did not work out. The AEM-7 did.
The last Amtrak GG-1 was retired in 1981. The last GG-1 in revenue service was retired by NJ Transit in 1983.
Check out the following American Society of Mechanical Engineers paper for some good info on the GG-1:
ASME GG-1