This is an incredibly rare shot - the Leyland TB's were withdrawn in 1940,and the route they ran - the 7 to Nechells (is that the answer you want?) was converted 'temporarily' to motor bus, but the trolleys never returned. Why was it taken off? Because the trolleybuses ran from Washwood Heath depot to Gosta Green to take up service with one pole up on the tram wire, and the other earthed via a 'skate' which was towed behind in the tram track. This skate bounced about and made a whole lot of sparks, which contravened the blackout regulations!
The buses were stored in Sampson Road tram works (the paint shops behind Kyotts Lake Road works) from 1940 to 1945, then sold for scrap.
So a picture of one in wartime, with light masks and the white lines round the streetside pole, is a real gem!
Where? Probably Nechells Park Road, at the terminus. The houses look right for the area at that time.