What's That Sound in the Subway? It's a Commercial.
Briefly

Not all subway announcements are informative; some are commercials like on radio stations. Revenue from such ads amounts to $170 million annually for the M.T.A.
The M.T.A. broadcasts audio commercials on subways, such as for TV shows like Gossip Girl and movies like Indiana Jones, as part of their advertising program.
Read at www.nytimes.com
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