For extending the trains I am on the fence. In theory I am in favor. However, NC taxpayers pay a lot to fund the Piedmont and the Carolinian. If the base of operations moved to Colunbia as the endpoint I would be a bit upset the few jobs involved with cleaning and servicing the trains left NC for a location in SC. Even a bigger deal to me would be the increased chances of late arriving trains in NC from the train starting at Columbia. That is another 150 km to run late. Had SC helped with the Piedmont from day one than I would not feel so strongly about this but as it is SC needs to do more than "just their fair share" at this point. Maybe a Chareston-Columbia route that aligned with the Piedmont trains timetables in Charlotte for a quick transfer could work. Or maybe a Greenville-Charlotte run that came into Charlotte just before the Piedmonts left Charlotte could work, and again with a transfer for the SC passengers. With the understanding if the SC train is more than 5 minutes late they may be left.
I want to see the Amtrak network expand and am surprised with what is basically some spite towards SC in my feelings. But here I am. Maybe I would change my mind if SC actually was serious about this. Deep down I would hope I would be happy with expanded service happened.
Well I do think my state needs to support more. I know at one time in 2012 the state of NC actually had a proposed extension down to CHS with a schedule. It was basically the morning Piedmont from Raleigh, and the Evening Piedmont from Charlotte being extended down.
I strongly doubt running from Columbia would cause the trains to be late. NS only has the following traffic on the R Line North.
12R (Columbia-Enola) departs Columbia around 0300 stops and works Rock Hill, Charlotte, and Linwood (Salisbury).
13R (Enola-Columbia) usually arrives around 2100 into Columbia.
P36 (Rock Hill-Chester Turn) runs now about Triweekly alternating with P32 (Rock Hill-Bowater) runs midday.
P53 (Pineville-Charlotte Turn) runs out of the Arrowood Industrial Park usually a mid morning train.
P65 (Columbia-Blythewood) usually midday and only about twice a week.
Couple that with decent sidings in Fort Mill, Henley (Chester), Simpson (Ridgeway), and a handful of shorter smaller ones at Blythewood, Rockton, Winnsboro, Rock Hill, and Chelsea you shouldn't really have a large problem with running a decent volume of trains and fairly reliably.
At one point a few years ago the R line north had a much larger amount of trains but that has all since disappeared with PSR, and shippers getting tired of NS's anti small customer attitudes.
As far as the other lines I mentioned.
Columbia-Charleston (SC Line)
-237/238 (Charleston-Atlanta) usually overnight across SC.
-BMW Autorack Trains (Two Pairs each way Daily Greer-Charleston)
-P66 (Columbia-Wateree) I've never seen this symbol in its current form. It used to be the symbol for the Columbia-Silverstreet (with trackage rights on CSX train)
-P28 (Columbia-Branchville) Mid Day Turn local
-P27 (Charleston-Pregnall) Mid Day Turn Local
-Rock Extras as needed.
Now that line is significantly more active but for the most part Amtrak could easily navigate it because it is not nearly as active as the Charlotte Junction-Greensboro line that the Piedmont currently runs on.
Columbia-Augusta
191/192 (Columbia-Macon) an overnight freight
P75 (Columbia-Monetta) Turn Local midday
P70 (Augusta-Johnson) Turn Local midday
Not a lot of traffic on this section of the line. Now it's been downgraded to 25 MPH but before that it was 50 MPH which by FRA classification is good for 60 for passenger service with the signals retimed. They were trying to save money when they did that.
We need more regional rail and the southeast especially the Carolinas have a lot of potential.
Yes my state has been lackluster in the past decades but that doesn't mean we have to stay that way. There is definitely room for it to grow and develop. I can speak from working some of the Carolina Shuttle routes (GSP-CLT, CAE-CLT) we have a lot of potential because there is a surprisingly a large amount of traffic going to GSO and RDU on their connection. Granted 40 percent of the connections are going to the NEC cities, and 40 percent going to the west coast. But the point is that 20 percent staying in the SE means we have some potential to make a really good network.