As far as Chicago is concerned, the obvious answer is to find room at Union Station.
For some unknown reason, neither CTA ("The El" and subways) nor Greyhound/Trailways are directly connected to the Union Station building; each is at least a two block walk, with limited accessibility.
Only Amtrak and Metra trains are inside the building. CTA does have a bus stop outside across the street.
Putting everything into one facility would make it easier to use all of it.
Edit: there are a couple of potential reasons for this. First, Amtrak likely does not want to compete with Greyhound on fare pricing. Second, adult beverages are sold within Union Station and Metra is particularly friendly towards them; Greyhound is very much not.
For some unknown reason, neither CTA ("The El" and subways) nor Greyhound/Trailways are directly connected to the Union Station building; each is at least a two block walk, with limited accessibility.
Only Amtrak and Metra trains are inside the building. CTA does have a bus stop outside across the street.
Putting everything into one facility would make it easier to use all of it.
Edit: there are a couple of potential reasons for this. First, Amtrak likely does not want to compete with Greyhound on fare pricing. Second, adult beverages are sold within Union Station and Metra is particularly friendly towards them; Greyhound is very much not.