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At first, you might think you could define some sort of an array
to hold a train full of engine, box-car,
tank-car, and caboose objects. You cannot, however, because
the objects stored in any one array must be of the same type. You could
have an array of engines, another array of box cars, another of tank cars,
and still another of cabooses, but you cannot have an array with some of
each.