The only active street trackage left in the Pittsburgh streetcar system is on Broadway in Beechview, and on Warrington and Arlington Avenues when the cars are detoured over the top of the hill instead of through the Transit Tunnel. But there are several sections of what we might call semi-street trackage, where the trolleys run in a separate right-of-way either beside or in the middle of the street. Willow Avenue in Castle Shannon is one of them: half the street is reserved for trolleys. Here a Silver Line car crosses Castle Shannon Boulevard.