Ok so I was a sucker and bought the Star Wars HO train from Hawthorne Village collectables and have paid $75 a piece for a cheap train with expensive graphics. The train came with a Locomotive and engine I think it is called an A and B unit? But the B unit is not powered.  It is just heavy compared to other cas due to the frame I guess it is called.  The frame in this B unit measures 6 3/8 inches long (I'm told there are diffeent lengths).  Now the question. Is there a powered unit I can buy and put the "cover" on it from this not powered one.   I am told it is easy as 6 screws and done but  I do not know how to find one.