The concrete balls are suspended just above the passing trains . The railway has fought a losing battle to keep riders off the tops of trains . If the concrete balls prove to be effective , more will be installed in other areas of the capital , officials said . A train passes over one of these concrete balls in New York City, NY on March 24, 2016
The concrete balls are suspended just above the passing trains . The railway has fought a losing battle to keep riders off the tops of trains . A train passes over one of these concrete balls in New York City, NY on March 24, 2016