The Jetrail ended at an elevated portion at the eastern end of the BN concourse- near what was BN's baggage claim area, along with their "round" gate area. I don't think any of it has been torn down yet (though it's likely to be soon, based upon recent city council yammerings); but after DFW opened, the BN area was renovated into office space for AOA (Aviation Offices of America, an aircraft insurance company, later known as American Eagle Group).
Did you know (since you're based at IAH, I assume you do, but many others don't) that, after DFW opened, and WN had just a small operation in AA's old wing, that the main hall of DAL, as well as much of the ticketing concourse to the east of the main hall, were remodeled into a sort of amusement park/ entertainment center, called LLOVE (two Ls), with skating (roller in the east area, ice skating over the terrazzo mosaic, thank God it was not destroyed!); movies upstairs (where Frontiers is now); and games, etc. The idea was that they needed something to do with that big unused building; hard to believe, now.
The east Concourse you described (from the main hall, with a moving sidewalk) was Delta's domain, as I recall, along with CO, and TI and EA had the middle concourse; someone correct me where I mess up, my memory's fading on this stuff.
I enjoyed going on the open-air observation deck often, and I had a father who would indulge me in this (as well as riding around on the Jetrail for fun, I kid you not). The Delta DC-8's made that peculiar "Howl" when they started up; I thought that was pretty cool.
Flying in to DFW today, from Gulfport/Biloxi, we went right over DAL and I had the chance to look at it; you really cannot tell, at all, where the old "deleted" runway (it was something like an 8/26, but I really don't know) was, nor can one tell where the original terminal was (it was pretty much where the Dalfort / Legend stuff is now). One of these days, I'll post some pictures I've found of Love in the old days of the Lemmon Ave. terminal, with DC-3s, DC-6s and DC-7s.
Now, do you have any memories of Amon Carter Field (Greater Southwest Int'l)? That's a story for another day, too!
...three miles from BRONS, clear for the ILS one five approach...