thumb|right|upright=1.0|A SEPTA route 15 PCC trolley in Philadelphia around 2006 Heritage streetcar lines are operating in over 20 U.S. cities, and are in planning or construction stages in others. Several new heritage streetcar lines have been opened since the 1970s; some are stand-alone lines while others make use of a section of a modern light rail system.
thumb|right|upright=10|A SEPTA route 15 PCC trolley in Philadelphia around 2006 Heritage streetcar lines are operating in over 20 US cities and are in planning or construction stages in others Several new heritage streetcar lines have been opened since the 1970s; some are stand-alone lines while others make use of a section of a modern light rail system