Over the past week there've been a number of assaults on the subway --gangs of teenagers roughing up and robbing other passengers.
Police say the subway system provides an easy getaway, which makes crime down under hard to control.
Starting today, more uniformed and undercover officers are riding the rails, especially around school dismissal time.
Police say the troublemakers are coming from just a couple of schools from the northern end of the subway.SEPTA says its investigators have been showing victims mug shots of well known troublemakers. They are hoping to identify four or five of the worst offenders.
One ironic note here. As part of this joint deployment, the Philadelphia police had to borrow radios from SEPTA police, because, six-and-a-half years after 9-11, Philadelphia police radios still do not work underground in the subways.