If you're interest in this, there are holiday operators that offer packages, e.g.:

> We offer the wonderful nostalgia of travelling by private train in luxurious carriages through spectacular landscapes behind vintage steam locomotives to captivating locations. With delightful cuisine and fantastic hand selected hotels all alongside our vibrant and experienced Holidays Team, you will be sure to experience an unforgettable trip.

* https://www.belletrains.co.uk/about-belle-trains

Richard Bowker of the Green Signals railway podcast has a video about their 2026 package through the Alps:

* https://www.youtube.com/watch?v=6QvRL98aEuQ

2027 will be in Ireland:

* https://www.belletrains.co.uk/emerald-belle-2027