As Ron indicated, you have a bit of a problem. The A unit you're missing is the one with the motors in it, so the units you have are not much good except as display pieces. It's unlikely you'll find the missing A unit without buying another set, although you may very possibly be able to buy the A-A set without the B unit. That still leaves you with an extra unpowered A, of course. You also might do a further search of your uncle's trains - that missing A unit went somewhere.
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