In order to create a vertical rule, we must understand that no such thing exists. Well, okay, since you're looking at 6 of them above, we'll discuss how they're created.
Vertical rules are simply really fat, really short horizontal rules.
Now with this also comes the problem of defeating the horizontal rule's limitation on text wrap. Nothing can go alongside a horizontal rule, at least according to standard HTML practices. Here is a visible table with a vertical rule inserted - The quick brown fox jumped over the lazy dog. The quick brown fox jumped over the lazy dog. The quick brown fox jumped over the lazy dog.