The Bloomfield Bridge spans a large number of railroad tracks , which are portions of lines managed by CSX and Norfolk Southern . The Martin Luther King Jr . East Busway , a bus rapid transit system , also traverses the ravine . Also under the edifice is a community football and baseball field . Originally known as Dean 's Field , it is historically significant as the place where Johnny Unitas played semi-pro football before jumpstarting his NFL career . After a shootout that killed three police officers , the area was renamed after a fallen officer who resided nearby
a shootout that killed three police officers
2009 shooting of Pittsburgh police officers
Bloomfield Bridge