Do you? A lot of this is also contingent on the host. In the case of the LSL, CSX has basically straight railed a humongous portion of the route and basically stated they aren't sending anyone if there is trouble. In this sort of cold, things are happening to the physical plant (broken rails, switch failures, signal failures) and the equipment, particularly at speed. Aside from the usual toilet, door and HVAC problems, locomotive horn failure crops up once the temperature plummets. Even the electric horns have failed in cold weather. Now, you have to stop and warn at EVERY grade crossing until you can get in thawed. On Amtrak territory, it is even worse as you are limited to 30mph.
Being out there without support (and possibly running low on fuel and other services) when the host has basically said they'll get to you when they get to you is a recipe for an issue.