National City Lines ( NCL ) took over management of PTC on March 1 , 1955 and began converting streetcar lines to bus routes .
A new company , Philadelphia Transportation Company ( PTC ) , took over PRT 's business in 1940 .
National City Lines ( NCL ) took over management of PTC on March 1 , 1955 and began converting streetcar lines to bus routes .
A new company , Philadelphia Transportation Company ( PTC ) , took over PRT 's business in 1940 .