There are awesome.
In the Red Line videos, it looks like you can walk in between Lake, Monroe, and Jackson on the platforms. Is that true?
You can on the Blue Line platforms a block west, but no longer on the Red line due to "construction" though from a casual view from the train windows the platform appears continuous. They cut it to create a connection for an "O'Hare Express Service" when Block 37 was built (across from, ugh, can't say it, evil, will go with the department store formerly known as Marshall Field's State Street Store) and included a station box for express trains to the airport, but nothing else was ever done other. It's big benefit was severing the platform, if you call that a benefit (though prepping for a future station, at least in theory is good, though I suspect a waste of money in this case).