Sounds like the train did stop in an accessible place. From RPA hotline:
“Unlike the hapless Wolverine passengers this past Fall, these AutoTrain passengers had heat, power, food, water, and working toilets throughout this incident. They were stopped at a small station in Denmark, SC, for about seven hours while the train waited for a new crew to replace the staff who had run out of service hours, which means any genuine medical emergencies (had there been any) could have been addressed safely. Extra food was put on, with pizza brought on board in Savannah, GA, and more breakfast food put on the train in Jacksonville, FL. Crews handed out snack packs, too”