According to Amtrak Status......it left Ft Lauderdale 17 minutes early today.
Fort Lauderdale (FTL) is a "discharge only (D)" stop for the southbound Silver Service trains. Since no passengers can board at FTL, the train can leave as soon as the station work is done, even if it is early.
Yes, and to elaborate more, all stops below Ft Lauderdale are Discharge only. That means it will leave nobody behind by leaving early.
Then look at page 48 of the current timetable. See how all the trains LD from Alexandia to Newark are Discharge only. Again, they can leave early at all of those stops since they carry no local business within the NE Corrider.
Southbound from NYC to ALexandria they stop to receive only so in that case they cannot leave early since in that direction they WOULD be leaving people behind.But the southbound Carolinian for some reason is not Receive only southbound.
This arrangement of NE travel by LD trains has a checkered history back before Amtrak. It has not historically always been true.