The two fell from the J train as it crossed from the Williamsburg Bridge into Manhattan just before 6 p.m.
One fell from the train onto the tracks on the bridge, and the other dropped through the tracks on the bridge and into a lot on Delancey Street.
This is the second consecutive Friday when there has been subway surfing on that line at the same location on the Williamsburg Bridge.
NYC Transit President Demetrius Crichlow released a statement saying,
"This is heartbreaking and knowing that riding outside trains is going to end tragically, it's incomprehensible-and pains me as a parent-that it continues to happen. I'm imploring families, friends, teachers, and others coming into contact with teens engaging in these suicidal stunts to get them to stop."