but you've only got 5 points so far so you can still identify where #21 operates for your last point if you want?
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I won't steal it, as Wendax was waiting for it.
Instead, I think that #2 is the Versare of the Boston Elevated Railway, for which I found this description :
Thank you to all who identified the Boston Elevated Railway bus #1204. It was built by, the drum roll please, the Versare Corporation of Albany, New York. From the information that people had sent us, the Versare Corp. built buses from 1925 through 1931. They became a part of the Cincinnati Car Company around 1929 and the bus pictured seated 37 passengers. The Versare buses were considered advanced for their day and some were powered by gas-electric motors. A number of transit companies in cities throughout the Untied States and Canada purchased them besides the Boston Elevated Railway, including Albany, Cleveland, Montreal, and New York.
The image can be found by googling it.