Fuel oil delivery

You see this fuel oil caps embedded in the sidewalks all over the place here. Most of the time they look ancient, and no longer serviceable, having been ground into the concrete by 100 years of passing boots and dog paws. Besides, is that even a thing anymore? Fuel oil delivery? To what, a big tank in the basement? Is there a coal chute too? Haha.

Well apparently it is still a thing:


UPDATE: Apparently I was sort of right (about it being antiquated).