Most of what you asked has been answered but I'll second and third and fourth! that you dont want to spend the night in the SAS Amshak, er Station! :excl: :excl: :excl:
The Dennys is a 24/7 operation, its a couple of blocks to the West on Commerce Street heading towards the Riverwalk (you go under the IH 37 Overpass), right in front of a La Quinta High Rise! Its crowded by late night types,but its quick and fairly cheap! The Riverwalk is another couple of blocks away, sort of a Bourbon Street on the River, overpriced,overhyped, over crowded!Not much else happening at night in downtown when the Eagle and Sunset arrives!
There are three Motels in the immediate area of the station, a Holiday Inn express, the Staybridge Suites (where the Amtrak crews stay) and across Commerce street in a very nice 200 year building, a nice Best Western Highrise hotel! (Ive stayed there, google up the rates, I got $79 for 2 with breakfast!/5 minutes to station!)
As to the Trains, as was said, #422 is the Coach you want, not #22! Its cut out from the Sunset Ltd. #2, three days a week,(along with the #422 Sleeper) when it arrives into SAS on the way to NOL, attached to the back of the Eagle#422/#22 which leaves @ 7AM for AUS/FTW DAL/STL/CHI!!You will be able to sleep on the Train if booked on #422 IF you come in from the West on #2/#422!You WON"T if youre boarding in SAS!!!
Sometimes there is a big difference in price between #422/#421 and #22/#21, other times its the same?? No real rhyme or reason, it's Amtrak!
Googleit up on Amsnag or Amtrak.com Hope that helps!