 While in service with KKS the motorized trams were numbered 201–220 and the trailers 250–261.KKS pained its trams red and they prominently featured the seal of Oslo.To distinguish KKS's trams from the other operators, a journalist started calling KKS the "Red Trams", to distinguish it from the green and blue trams of KSS and KES, respectively, and the name stuck.