Amtrak is located in the lower level. I'm in and out of there often, or was when I was practicing law. Never went near the two areas you mention, as I would ride the escalator up to a street side entrance and catch cabs out of there after arriving at Amtrak on the lower level. The lower level is Amtrak and also the Metra tracks are there too--the CTA trains. Those tracks are accessible from the lower level and parallel the Amtrak tracks on that same lower level. This probably isn't much help.
The Great Hall is on the lower level and has Clinton and Canal Street entrances. You'd see that if you were going to or from the Amtrak, Metra, or South Shore lines. I've never seen the staircase, other than the ones taking you from the street to the lower levels.
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