Somehow the night Train is still completely booked out every time I Take it, weeks in advance, despite “top Dollar” prices.

OK but this could be just a good match of supply and demand. To come to any conclusions we would need the total number of passengers compared to flight seats for that route. We both know that the latter vastly outnumbers the former.

And Hotel rooms usually also don’t get cheaper If you travel alone and Not as a Couple

Sure, and anyway a high price is surely fair given the presumed cost of transporting a hotel room 1000km or whatever. This is why, for me, there's no winning: either it's an unpleasant hostel-on-wheels, or it's a pleasant but expensive rolling hotel room which makes no sense if you're trying to reduce your carbon footprint.