Something people don't discuss a lot is Columbia's ridership. If you look at the current RPA numbers from 2019 you get an average of 42 people boarding/detraining on every train or 84 passengers per day. For a station with service at 1:38 AM, and 4:01 AM that is incredible. Now imagine if you had a second frequency at better hours. Or if you adjusted the schedule to move 91 into the 11 PM, and 92 into the 7 AM hour.
For comparisons lets look at Charleston, SC which has four daily trains (2 NB, 2 SB) at decent hours for all but one. With a station much further from downtown.
41 Passengers per Train, or 164 Passengers Per Day.
Here are the per train numbers at the other stations unique to the Silver Star.
Southern Pines, NC: 10 Passengers Per Train, 20 Passengers Per Day
Hamlet, NC: 5.7 Passengers Per Train, 11 Passengers Per Day
Camden, SC: 4.7 Passengers Per Train, 9 Passengers Per Day
Denmark, SC: 4 Passengers Per Train, 8 Passengers Per Day
Cities Unique to the Silver Meteor/Palmetto in North/South Carolina
Fayetteville, NC: 32 Passengers Per Train, or 131 Passengers Per Day
Dillion, SC: 7 Passengers Per Train, or 14 Passengers Per Day
Florence, SC: 27 Passengers Per Train, or 108 Passengers Per Day (This station receives a lot of Columbia traffic)
Kingstree, SC: 7 Passengers Per Train, or 28 Passengers Per Day (Interesting that the No. 6, and 7 popular destinations are the next station in both directions)
Yemassee, SC: 25 Passengers Per Train, or 6 Passengers Per Day.
Yemassee, Kingstree, Dillon, Camden, Denmark, Hamlet, and Southern Pines are all similar to each other. Note that the routes with four trains a day (2 NB, 2 SB) perform much better.
These are cities Amtrak does limited (street sign pointing to the station) to no marketing in. Imagine what could be done with better marketing, and better times in these cities.