Odd that the factory missed the window-block on the AFT sound car, but got it right on both the Amtrak and Penn Central sound cars (the other sound cars I purchased from this batch of production). On both of those cars, a plastic bulkhead hides the electronics on one side of the car, and they're set back from the window a bit -- just like on the AFT sound car. However, on the other side of the Amtrak and PC sound cars, it appears either a piece of thin plastic or opaque tape has been applied directly to the inside of the windows. Can't say for sure until I look inside (which I probably won't do anytime soon). Take a look below at these quick iPhone photos below...
Whatever the factory did for these two cars is what should have been done for the AFT (and presumably the Pennsy BL) sound cars as well, but unfortunately that wasn't the case here. 
David
