Original sentence: One car, #4004, was donated to the Pennsylvania Trolley Museum where it has become part of a collection of historic streetcars and trolleys from all across the United States and other nations.The line closed on 4 September 1999, and the last four PCCs of the Port Authority of Allegheny County were decommissioned
Edited sentence: Car #4004 was donated to the Pennsylvania Trolley Museum where it has become part of a collection of historic streetcars and trolleys from all across the United States and other nations.During the final years of operation, three PCCs were used with a fourth kept as reserve.The line closed on 4 September 1999.The line to Drake became part of the 36 Shannon-Drake until the 1980's