So all those screaming about PTC should know that under signal suspension there would have been no PTC active either.
That would depend on the system and if they suspended PTC. ACSES will still work during a cab signal suspension and a wayside signal suspension. It is even programmed to protect improperly lined facing point switches when operating against the current of traffic. You'd have to actually suspend ACSES rules.
Dark territory? Signal suspension? What does that stuff mean? Please excuse my ignorance
Making an extremely long and detailed story short, territory that operates without some sort of signals (cab signals, wayside signals) is typically referred to as "dark territory." Typically, these tracks will need some sort of movement authority or permission for trains to operate on the track.
In signaled territory, movements are typically governed by signals (wayside, cab signals.) Permission is granted by signal indication.
When they take the signals out of service, it is called a signal suspension and movements revert back to movement authorities.
Amtrak has posted an alert on their website:
https://www.amtrak.com/alert/amtrak-train-91-derailment.html
Due to this incident and the resulting temporary track closure, Trains 91 & 92, the Amtrak Silver Star will detour between Hamlet, N.C., and Savannah,Ga., until further notice. Passengers will be provided alternate transportation to missed stops, as available.
There are a couple of potential detours available. I guess they'll pick whichever detour CSX can support and the route that will likely lose the least amount of time.