For a long time I did railway simulation using the Trainz software. I spent ten years re-creating a short branch line near my house in North London. It closed in 1954. There are some screenshots here.
Also the URL’s for Youtube videos of the simulation.
Cadillac Cars from the 1950s
I fell in love with American cars, especially Cadillacs, when I was ten. I went on to own quite a few. Details are here.
Meccano Construction toy
This was a childhood hobby of mine. I recently revived it, purchasing a lot of parts that were in bad condition and therefore very cheap, and restoring them. The restoration process is just as satisfying as building the models. A description of Meccano can be found here