... but that doesn't say it all. I've noticed quite a few folks both here and on TSW discussions at DTG advising avoidance of saving and resuming scenarios. To the contrary, I've found that process to be most helpful, even or perhaps I should write especially with a TSW shut-down along the way.
For example, I'd been "working" at the Fully Fueled scenario off and on for several days, arriving at what I expected to be the final destination yesterday. But, more fun was to come: 1) shut down the lead engine (which I'd been driving); 2) uncouple the 2 lead engines from the rest of the train [I neglected to set the handbrake on the 1st freight car, but no one noticed, so I kept my mouth shut); 3) walk to the other end of the (infinitely) long train; 4) uncouple the pair of trailing engines from the freight cars; 5) park those engines on a spur; 6) shut down those engines -- including a step I'd never encountered before; and, 7) walk to a nearby pickup truck.
Step 5 involved a problem: a red ground signal guarding the stub. A switch ahead obviously had to change, but it is electrically operated. After waiting a while, I resorted to saving and quitting again. This morning, I resumed the scenario, still sitting a short distance from the red signal, of course, and was just about to try reversing a short distance when the signal turned green. Just to add insult to injury, however, it turned out that there were two pickup trucks parked in the vicinity and, of course, headed for the wrong one first! (Hint: after leaving the cab, look around for that gizmo that marks the next destination.)
All in all, I'd rate this scenario as quite satisfactory and wish that I had the stamina to run it all in one session. Perhaps I'll try it again sometime.