Street Running Erie

Does anyone have a cut off date for the 19th St route at Erie, Pa.
Also, can anyone suggeat a 2-week circular itinerary to see as much street running as possible on the basis of a fly-drive to a major airport.
So far, the only line I have seen is Brownsville, about 2 years ago: solid ‘Big Blue’ - I understand it is now about 50/50 CSX/NS -is this correct?