Apparently the ad-wrapped subway car experiment was enough of a hit for CBS Outdoor to start selling the advertising panels on the 1, 2, 3, 4, 5, 6, 7 and shuttle trains beginning in 2009, and there are more initiatives on the way: "Because the New York subway runs 24 hours a day, it is difficult to put ads on the far side of subway tracks. Consequently, CBS is considering projecting images across the track. They will be similar to ads that are projected onto station walls, which CBS began about two years ago." [NYT]
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