The argument for railfans wearing vests is so they are visible to train crews... I think.
I think most people would agree that if you feel you need to wear a vest for train crews to see you, you're too close to the tracks.
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I've never worn a safety vest while railfanning. I think there's a fair chance that one might be mistaken for a railway worker / manager.
Oddly enough, about a month ago I was railfanning the CP Emerson sub when a passing CP Police officer stopped and recommended that I wear a vest. He said that he had been farther down the tracks and couldn't see me in my dark coat. I was a little confused about why that would matter, since I was well away from the tracks, but I thanked him and he went on his way. I think he was just being friendly.
So... what do you think? Have you ever worn a vest while railfanning? Have you seen other railfans with bright safety vests?