Hi Yardie
Even though the Board of Transportation came about in 1940, most of the trolleys in Brooklyn still retained their tuscan and creme colors until the postwar years . Many of the cars in the 8000 series which were referred as the "Peter Witts" were scrapped still in the B&QT colors All of these were gone by 1950 or so. These cars were all double enders so they had two sets of doors on both sides of the car and a pole at each end.
The 6000 series were single enders and were a unique B&QT design and not at all like the WBB model. There were about 200 of these, they were newer than the 8000 series and most received the Board of Transport colors although a some were scrapped wearing the B&QT colors . All gone by 1950-51.
PCC cars were still in their delivery colors sort of a Brown color in the early post war years. All were repainted into the Board of Transport scheme . They operated until 1956 lastly on the Church Ave, Mcdonald avenue and Coney Island avenue lines in Brooklyn. There was a stipulation in the financing agreement for these cars that the city operate them for at least 20 years and so they did.
The Green and Silver colors started being used after World War 2 . There were cars in these colors without the BOT seal as well as I remember. When the IRT and BMT which included the B&QT surface trolleys in Brooklyn were taken control of by the Board of Transportation in 1940, there were no real efforts to integrate the operations as one system other than free transfer points that were established. They still operated as if they were the same companies and people referred to them by those names. It wasn't until 1953 when the Transit Authority was formed that the system integration began.
So even though the WBB car is in the Board of Transport colors with the seal, we and the city still considered the real cars as B&QT back in the late 40s and up to 1950 or so when we rode them.