(Big hugs to all nations involved of course)
[0] Just from a single camera at the front of the train, no further editing. I haven't seen the Norwegian and Swedish Slow TV yet, but I get the impression they use multiple cameras. The German version was super simple, but very relaxing in its simplicity.
The wikipedia link above has 2009 as the earliest date.
In Austria you would find random scenic train rides on TV whenever you would switch on the TV in the middle of the night at least from 2002 onward, if not earlier... And I don't think this started in Austria.
[1] https://youtu.be/7ycjaWRnETU [2] https://youtu.be/2jI-Sn_X7x4?t=213
When did the UK start broadcasting yule logs? In the United States it goes back to at least the mid 1960's, and possibly before. Stations in most large cities still air the show, though shorter now (1-3 hours) than before.