Well you beat me to the punch here. I was just about to correct my earlier assessment. The Bluebirds lasted quite a while from he 1930s into the mid 50s. When new , they ran on the Fulton El to Park Row along with the Green Hornet and the Zephyr, the other BMT experimentals. When the Fulton El was closed in 1940, they went to work on other BMT Elevated lines finishing out on the Canarsie line. The photo is on this line.