Battery electric locomotives, ptc, trip optimizer, etc could make it easier for the well heeled to travel by private trains. Just get licensed as an engineer or hire one. Then pay a rr for track access and dispatching priority. As your little 2 or 3 car train whizs through the country. Traveling in space and comfort better than any jet or RV. Bringing your car, motorcycles, etc.

The only hard bit would be charging. But I imagine you could go a thousand miles with a light train being pulled by a modern Battery electric freight loco. Since they're built to pull many thousands of tons hundreds of miles. Instead of few hundred.