Make sure you get one that matches American gauge and isn't one of the the meter gauge mountain trains
gauge is likely easy to change. Not cheap, but Amtrak demands expensive inspections and refurbishment to run, so the cost of changing the gauge is likely fairly small compared to the other costs.
Not sure if it directly helps here, but multi gaage railway cars are a thing. Iirc on some European lines, the trains switch their gauge.
gauge is likely easy to change. Not cheap, but Amtrak demands expensive inspections and refurbishment to run, so the cost of changing the gauge is likely fairly small compared to the other costs.