Not content to simply line the subway station entrances, station walls, station signs, and interior of buses and trains with advertisements, New York City transit is reportedly set to enter the final frontier: ads on the outsides of subway trains. They're already testing out the idea with Continental Airlines ads on the 42nd St. shuttle [NYP]. Subway officials think this idea will go great with their existing "brand cars," where one advertiser takes over the interior of a whole car. As terrifying as this practice sounds, we know they need the money. So we'd like to strike a compromise: they're allowed to sell every last inch of the trains to advertisers, but in return they have to bring back this practice:

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