As much as I like this meme, I'm a bit frustrated that the creator has only 151 transit systems. I think there should be a lot more, especially several U.S., Canadian and some other cities are missing from what would be a very long list.
The list consists of subway/underground systems. They do not include cities or regions with light rail lines or commuter rail lines. I'm impressed with the list and I noticed that the person who created the meme acknowledges that little "controversy".
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What's missing?
Did you use the search function?
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