Michigan trains usually all have snack coaches, as do Missouri trains. All of the above usually have 2-5 horizon coaches and one amfleet snack car stocked with ampizzas that the clerk will microwave for five minutes for you, or amburgers made of the finest ground gopher meat available.
As to where the horizons are - who knows? Brighton Park shops or 14th street is my guess. Maybe Beech Grove, but that's a lot of car shuffling for 1-2 weeks of cold.
Frankly, I've never seen anything but the PM get superliners because the PM travels lake-effect-snow country only. I would suspect the IL-MO trains have superliners due to the recent ice storms.
You would think since horizons don't have trainline doors, that they would all be retrofitted with swinger doors at the next rebuild - ice and cold is nothing new to Michigan trains, and happens a few times a year to IL-MO trains as well.
The new Acela: It's not Aveliable.