RR.Net is not "mine", to guard. That being said, I am sure vendors are welcomed, with open arms, in the appropriate venue. The header on top of this very thread, is there for vendors to display their wares, for all to see. The site is run on money, and a person profiting from the sale of items, goods or services would more than likely have to compensate the owners, of THIS site, for the priveledge of advertising here.
I would not imagine why a train could not operate in dark territory, with a track warrant/train order, specifying limits, and directions. The real reason buses now carry passengers, in places where trains once ruled, is a simple economic decision, made by the carriers. Trains were/are too expensive to operate, in some areas. They thrive, where there is sufficient customer base, for the service, and they languished, and finally died, where that base was insufficient. It's hard to justify a quarterly operating loss, in the thousands of dollars, so a few folks can ride a train. I would like to see a return to the passenger trains, and the commuter trains of earlier decades, but that's probably a thing that will not come to be, now or in the foreseeable future........