A PCC car is built in on TRS6 and up, a Peter Witt was made way back before UTC(?) and is on DLS, and I made a four wheel streetcar that is on the DLS and at TPR Depot.
Okay I won't say it.... but there are some PCC trolleys up on the DLS. I downloaded the MBTA cars for my route since it's based on the greater Boston area where I live. There are also some MBTA and MUNI Boeing LRVs also.
Not to be rude, but I asked "Please don't say the DLS" because I downloaded the Riverside, Canal and Desire streetcars, the PCC streetcars and the Peter Witt streetcar.