Ok Here is what I think. The Middle Village car is at the Queens end of the line which I believe was at Metropolitan Ave. near 69th street near the hotel and restaurant Neidersteins. The Restaurant is now gone as well as the trolley.It looks like the folks are in front of the trolley depot.
Next the Bluebird. In this photo, it looks like this is the first day this train set is out on the road.Perhaps it was the inaugural run. I believe it is on the Fulton street El Trackage on the lower level of the Atlantic Avenue Broadway Junction complex. It will be turning out from under onto Fulton Street and heading west towards downtown Brooklyn at Sands Street and over the Brooklyn Bridge to Park Row,
Finally Coney Island Yard. Thinking this photo was made just after WW2 in the 1940s. This area I think was used to store equip,emt heading for the scrappers . The trolleys were all older than the Peter Witts, the 600s and the PCC cars still serving Brooklyn at the time. I remember the deck cars running on the Wilson Ave Line from Bridge Plaza.
Next to the trolleys are surplus El rolling stock from the Brooklyn Els that were closed and services eliminated in the 1940s. This include the Fulton street line to Rockaway Ave and the Fifth EL services including Culver and West End services which went to Park Row before the Brooklyn Bridge line was eliminated in 1944. some of those cars in the photo are in real sad shape.
Great Photos guys