The buses shown above and below¹ are some very early examples of transit that was powered by fuel (rather than electricity, as with the electric railway or trolleys). According to Kelly & Francis in Transit in British Columbia: The First Hundred Years, by the start of WWII, the bus fleet in Vancouver numbered 25:
Transit was so heavily used during the war that the government’s war allocations board in Ottawa became responsible for new bus orders for all Canadian cities. The board was headed by Sig Sigmundson, who later became transportation manager for the BCER. Buses began arriving in Vancouver painted their wartime colours of olive green or grey, and were quickly placed in service. (p. 89)
The location where the buses were parked seems to have been the Cambie Garage which was situated on Cambie between 14th and 16th Avenues (thanks to Angus McIntyre for his comment below which made note of this and other details).
¹These images may be the same bus, photographed from different angles.