Regional Rail's 13 lines are the key public transportation artery for commuters in the city and in Bucks, Chester, Delaware, and Montgomery Counties. Assembled from the bones of the Pennsylvania and Reading Railroads, the system moves up to 65,000 people per weekday on 788 trains. Since the flaws put the Silverliner V's out of service, SEPTA has been running 549 trains per weekday. Passengers have been encouraged to find other modes of travel, and while it wasn't clear how much ridership had dropped last week, it had certainly declined by the tens of thousands.