As a child in England, I collected train identification numbers as a hobby.
It was a harmless holiday pastime, spending endless hours sitting on a creosoted fence close to our local village railway station, waiting patiently for the big express trains to thunder past so one could happily tick them off in small books that identified the rolling stock of that particular railway company.
One proudly showed off one's book to other childhood friends, who were also "train-spotters", as the pastime was called.
Interestingly, I don't recall other kids cheating on their spotting claims. It was clearly a matter of honour that you really had identified a valued prize, such as the Flying Scotsman, as it roared past your village station, belching steam and coal sparks.
Now I'm old and crabby and steam trains hardly exist any more, I've had to find a new holiday hobby, particularly because I'm bored and idle and the caregiver has scuttled off with my little ones to the swimming pool.