The PTC's revised project also included a new tunnel for subway–surface trolleys underneath the campus of the University of Pennsylvania, continuing from the original western portal at 23rd and Market streets to the 36th Street Portal, as well as to 40th Street and Baltimore Avenue for other trolley routes besides the 10.
The PTC's updated project included a new tunnel for connecting subway–surface trolleys at the University of Pennsylvania campus, from the original western entrance at 23rd and Market streets to the 36th Street Portal, with additional routes extending to 40th Street and Baltimore Avenue.