When I was a child, I was given a Hornby train set. I loved playing with my train set and observing all the details in the train, such as the lights at the front. I also loved to mount the train on the tracks, it takes a lot of patience to get every wheel aligned. Half the fun of having a train set is designing the scenery. You would try to make terrain for the train to move across. The problem with trian sets is you need a lot of space because the train has to move along the tracks.
I wonder if they ever made a tiny scale train set, a size so small the whole train fits in your hand. A train set for people that don't have much space.
I considered integrating a trainset into the bar table of my future man cave. I decided I wouldn't because it would clash with the theme of the bar in the man cave (90s gaming). The train set would be a tiny metro rail train hidden between the walls and perhaps on another table.