Boston Vicinity, c.1905. Trolley Service Pole Upper View with Sidepins on Top.

By Joe Maurath, Jr.; posted September 22, 2020

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Perhaps the sidepins carried fire alarm circuits or was a private telephone line belonging to the transit company for dispatching purposes. I am not sure what any of the four insulators were on the trolley service crossarm. However the larger one on the left might have been a CD 140 Jumbo.