The 13 suspects were accused of rubbing, grabbing and flashing women on crowded trains, the New York Daily News said. A 14th was arrested for grand larceny.
What they didn't know was the "victims" were cops posing as businesswomen, police said.
It all went down during the morning and evening rush hours of May 23 and 24, Transit Bureau Chief James Hall said.
Swim Week Miami Beach 2014 [PHOTOS]