Don't feel like it'll be a Useful Feature to add. The Isle of Wight already has a Collectable being a Tripod + Camera at the Stations. But I do like the Idea.
I like the idea however I think it would need to be a randomised chance of a trainspotter spawning at stations. Higher at Large Stations, Lower at Smaller Stations. And of course when a Railtour is passing, the chances are increased everywhere.
I think a few people with cameras alongside the track on heritage routes such as WSR and railtour services would be pretty realistic, wouldn't it? I think it'd add a bit more immersion, while I suspect it's relatively easy to add.
Totally like this idea (and railway maintenance workers along the line, which are also a big desire of mine as they can be seen in soo many cab views I've watched). As others have said, some randomisation would be fun, but definetely on routes like WSR it would increase immersion and would be a fun thing that makes you go 'hey look at that!'. I made a thread about passenger and staff behaviour a while ago, and I've added trainspotters to the wishlist now .