The reason they don't "promote" the dome, is to avoid disappointment if they don't operate it for some reason...
The Dome was not on 391 today.
That's what I mean....I'm disappointed.The Dome was not on 391 today.
It's something similar to when Amtrak announces planned detours like Tehachapi for the Starlight, and some fans will travel long distances to get the rare-mileage experience.
Then for some reason like weather, or early conclusion of construction, the train will run its regular route, causing disappointment for those affected....
So no promotion for the dome, except for the usual foliage trains....