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Every 105 feet-- because it's a multiple of the 15 feet between
insulator manholes-- there was a cleaning manhole larger than the
insulator manholes, although still less than 3 feet across, and it is
not located between the rails but along the outer side of one running
rail.
UPDATE...May 27... I'm told there were scraper cars
that pushed along street litter in the conduit up to the cleaning
manholes, where it could be shovelled out. I now think that's what
these two are, but I'm not so sure. Every fourth one (420 feet) was a
little larger, and called a feeder manhole because it also provided
access to the electrical feeder running underneath the contact
rails.
These are harder to find exposed. The one at 113th Street actually
has a hole in it, and the sunlight did not illuminate the
bottom of the space underneath. It says "3 AVE" somewhat like the
conduit manhole covers.
The only other one of these I could find is up near 122d Street and
its cover has a different design.
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