TCT CO is what is printed on the manhole cover. Not 100% sure what TCT stands for, I would guess Twin Cities Transportation Company. I just don't know exactly what it stands for. I found this cover in a very old part of downtown St Paul near the farmers market that does not see very much traffic. It is located as you enter a parking area with some of it paved over with black top, which is partly visible in this photo. I do wish there would have been a date stamp of some sort to give me a time period to research back to. Google searching found nothing, perhaps the search term I used was not bringing me the answers I was looking for.
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St Louis, Missouri