A nice touch would be a cab car. My understanding is that the San Diegan Amtrak cab cars were actually Metroliners with the pans removed and conventional passenger car trucks installed. Oh the sad task of explaining push-pull passenger operation to a young innocent child. 
Yes, the metroliner cars were converted to cab cars, but save for the tube shape, there's some apparent differences. They started out with the electrical equipment on the roof, but it was moved underneath during a rebuild somewhere along the way, giving them a different set underframe equipment. They also ride on different trucks. It could be done, but there's more to it then slapping a cab on one end and a horn on the roof.
But in theory, since I believe the basic tubular shaped body of the metroliners is the same as that of the amfleet cars, someone could make metroliners as a parallel project?
