jis
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AEM-7s have very little to do structurally with their European brethren. Their carbody is a completely different beast even though externally they look similar.Well usually the big hurdle causing them to have everything custom is FRA regulations. There's only been two foreign trains that I know of that Amtrak properly uses (I'm not counting the demo trains), and one of them runs with an FRA waiver. They would be the Talgos & the AEM-7. I highly doubt that the Velaro, any Shinkansen, or TGV meets FRA regulations, causing Amtrak to have order a custom build.
peter
As mentioned above, FRA is in the process of creating the so called Tier III regulations which will permit almost off the shelf high speed trains to operate at upto 125mph mixed with other sets, and above 125mph on dedicated ROW.
Amtrak and FRA are working together to create a special set of rules to allow Tier III sets to operate mixed with current existing equipment at over 125mph, for use on the NEC.