This view shows the correct, unfaded, colors of a Louisville Railway Comapny unit and it is what #100 and PCC 502 should look like; however, while painted in LRCo colors this particular PCC currently operating in San Francisco is not from Louisville as it lacks the full-length roof cowling.
It is ex-Philadelphia Transportation (SEPTA) 2101, a 1948 St Louis built car.
Courtesy the Harry Porter collection