There is both a North and South view of Thomasville, NC.
1. It has no cost from what I can tell.
2. It seems to be a full motion camera every time I visit.
3. It does rewind but it might only be for 4 hours but it does have sound
The 10 Piedmont trains would run by here, 2 Carolinian trains run by here and at least the northbound Crescent will be during daylight year round (if only by a few minutes in the deep of winter if on time.). The southbound Crescent will be 1:00 am-ish if on time.
It seems to be an active rail cam 24/7. It might be a nice addition to the list as you do have the camera in Spartenburg, SC but that is a night-time train both directions and only sees the Crescent (which is your interest of course.)
Train Watching | Train & Railroad Live Stream Camera — Thomasville, NC
Both cameras are on the same webpage but you can full-screen one of the other.